diff --git a/data/HBV_preCore_reference_bolero.fasta b/data/HBV_preCore_reference_bolero.fasta
new file mode 100755
index 0000000000000000000000000000000000000000..af25bac0fda66e4258d245cc3d3a05ba697d217e
--- /dev/null
+++ b/data/HBV_preCore_reference_bolero.fasta
@@ -0,0 +1,2 @@
+>preCore_XGR :: Concatenation 122nuc_progenomic_NC_003988.2_BeforeATG2
+GACCTTGAGGCATACTTCAAAGACTGTTTGTTTAAAGACTGGGAGGAGTTGGGGGAGGAGATTAGGTTAAAGGTCTTTGTACTAGGAGGCTGTAGGCATAAATTGGTCTGCGCACCAGCACCATGCAACTTTTTCACCTCTGCCTAATCATCTCTTGTTCATGTCCTACTGTTCAAGCCTCCAAGCTGTGCCTTGGGTGGCTTTGGGGCATGGACATCGACCCTTATAAAGAATTTGGAGCTACTGTGGAGTTACTCTCGTTTTTGCCTTCTGACTTCTTTCCTTCAGTACGAGATCTTCTAGATACCGCCTCAGCTCTGTATCGGGAAGCCTTAGAGTCTCCTGAGCATTGTTCACCTCACCATACTGCACTCAGGCAAGCAATTCTTTGCTGGGGGGAACTAATGACTCTAGCTACCTGGGTGGGTGTTAATTTGGAAGATCCAGCGTCTAGAGACCTAGTAGTCAGTTATGTCAACACTAATATGGGCCTAAAGTTCAGGCAACTCTTGTGGTTTCACATTTCTTGTCTCACTTTTGGAAGAGAAACAGTTATAGAGTATTTGGTGTCTTTCGGAGTGTGGATTCGCACTCCTCCAGCTTATAGACCACCAAATGCCCCTATCCTATCAACACTTCCGGAGACTACTGTTGTTAGACGACGAGGCAGGTCCCCTAGAAGAAGAACTCCCTCGCCTCGCAGACGAAGGTCTCAATCGCCGCGTCGCAGAAGATCTCAATCTCGGGAATCTCAATGTTAGTATTCCTTGGACTCATAAGGTGGGGAACTTTACTGGGCTTTATTCTTCTACTGTACCTGTCTTTAATCCTCATTGGAAAACACCATCTTTTCCTAATATACATTTACACCAAGACATTATCAAAAAATGTGAACAGTTTGTAGGCCCACTCACAGTTAATGAGAAAAGAAGATTGCAATTGATTATGCCTGCCAGGTTTTATCCAAAGGTTACCAAATATTTACCATTGGATAAGGGTATTAAACCTTATTATCCAGAACATCTAGTTAATCATTACTTCCAAACTAGACACTATTTACACACTCTATGGAAGGCGGGTATATTATATAAGAGAGAAACAACACATAGCGCCTCATTTTGTGGGTCACCATATTCTTGGGAACAAGATCTACAGCATGGGGCAGAATCTTTCCACCAGCAATCCTCTGGGATTCTTTCCCGACCACCAGTTGGATCCAGCCTTCAGAGCAAACACCGCAAATCCAGATTGGGACTTCAATCCCAACAAGGACACCTGGCCAGACGCCAACAAGGTAGGAGCTGGAGCATTCGGGCTGGGTTTCACCCCACCGCACGGAGGCCTTTTGGGGTGGAGCCCTCAGGCTCAGGGCATACTACAAACTTTGCCAGCAAATCCGCCTCCTGCCTCCACCAATCGCCAGTCAGGAAGGCAGCCTACCCCGCTGTCTCCACCTTTGAGAAACACTCATCCTCAGGCCATGCAGTGGAATTCCACAACCTTCCACCAAACTCTGCAAGATCCCAGAGTGAGAGGCCTGTATTTCCCTGCTGGTGGCTCCAGTTCAGGAACAGTAAACCCTGTTCTGACTACTGCCTCTCCCTTATCGTCAATCTTCTCGAGGATTGGGGACCCTGCGCTGAACATGGAGAACATCACATCAGGATTCCTAGGACCCCTTCTCGTGTTACAGGCGGGGTTTTTCTTGTTGACAAGAATCCTCACAATACCGCAGAGTCTAGACTCGTGGTGGACTTCTCTCAATTTTCTAGGGGGAACTACCGTGTGTCTTGGCCAAAATTCGCAGTCCCCAACCTCCAATCACTCACCAACCTCTTGTCCTCCAACTTGTCCTGGTTATCGCTGGATGTGTCTGCGGCGTTTTATCATCTTCCTCTTCATCCTGCTGCTATGCCTCATCTTCTTGTTGGTTCTTCTGGACTATCAAGGTATGTTGCCCGTTTGTCCTCTAATTCCAGGATCCTCAACAACCAGCACGGGACCATGCCGGACCTGCATGACTACTGCTCAAGGAACCTCTATGTATCCCTCCTGTTGCTGTACCAAACCTTCGGACGGAAATTGCACCTGTATTCCCATCCCATCATCCTGGGCTTTCGGAAAATTCCTATGGGAGTGGGCCTCAGCCCGTTTCTCCTGGCTCAGTTTACTAGTGCCATTTGTTCAGTGGTTCGTAGGGCTTTCCCCCACTGTTTGGCTTTCAGTTATATGGATGATGTGGTATTGGGGGCCAAGTCTGTACAGCATCTTGAGTCCCTTTTTACCGCTGTTACCAATTTTCTTTTGTCTTTGGGTATACATTTAAACCCTAACAAAACAAAGAGATGGGGTTACTCTCTAAATTTTATGGGTTATGTCATTGGATGTTATGGGTCCTTGCCACAAGAACACATCATACAAAAAATCAAAGAATGTTTTAGAAAACTTCCTATTAACAGGCCTATTGATTGGAAAGTATGTCAACGAATTGTGGGTCTTTTGGGTTTTGCTGCCCCTTTTACACAATGTGGTTATCCTGCGTTGATGCCTTTGTATGCATGTATTCAATCTAAGCAGGCTTTCACTTTCTCGCCAACTTACAAGGCCTTTCTGTGTAAACAATACCTGAACCTTTACCCCGTTGCCCGGCAACGGCCAGGTCTGTGCCAAGTGTTTGCTGACGCAACCCCCACTGGCTGGGGCTTGGTCATGGGCCATCAGCGCATGCGTGGAACCTTTTCGGCTCCTCTGCCGATCCATACTGCGGAACTCCTAGCCGCTTGTTTTGCTCGCAGCAGGTCTGGAGCAAACATTATCGGGACTGATAACTCTGTTGTCCTATCCCGCAAATATACATCGTTTCCATGGCTGCTAGGCTGTGCTGCCAACTGGATCCTGCGCGGGACGTCCTTTGTTTACGTCCCGTCGGCGCTGAATCCTGCGGACGACCCTTCTCGGGGTCGCTTGGGACTCTCTCGTCCCCTTCTCCGTCTGCCGTTCCGACCGACCACGGGGCGCACCTCTCTTTACGCGGACTCCCCGTCTGTGCCTTCTCATCTGCCGGACCGTGTGCACTTCGCTTCACCTCTGCACGTCGCATGGAGACCACCGTGAACGCCCACCAAATATTGCCCAAGGTCTTACATAAGAGGACTCTTGGACTCTCAGCAATGTCAACGACCGACCTTGAGGCATACTTCAAAGACTGTTTGTTTAAAGACTGGGAGGAGTTGGGGGAGGAGATTAGGTTAAAGGTCTTTGTACTAGGAGGCTGTAGGCATAAATTGGTCTGCGCACCAGCACCATGCAACTTTTTCACCTCTGCCTAATCATCTCTTGTTCATGTCCTACTGTTCAAGCCTCCAAGCTGTGCCTTGGGTGGCTTTGGGGCATGGACATCGACCCTTATAAAGAATTTGGA
diff --git a/data/HBV_preCore_reference_bolero.gtf b/data/HBV_preCore_reference_bolero.gtf
new file mode 100755
index 0000000000000000000000000000000000000000..12b86d454cfd42f1a106b94203e954b1ecfca5df
--- /dev/null
+++ b/data/HBV_preCore_reference_bolero.gtf
@@ -0,0 +1,96 @@
+# GTF file produced by Xavier Grand
+# 12/01/2022
+# First nucleotides correspond to -122 nuc before ATG of preCore
+# Each transcript starts at TSS according to Stadelmayer et al. 2020)
+preCore_XGR	XGR_manual	transcript	1	3421	.	+	.	gene_name "preCore";gene_id "preCore";transcript_id "preCore"
+preCore_XGR	XGR_manual	exon	1	3421	.	+	.	gene_name "preCore";gene_id "preCore";transcript_id "preCore";exon_number "1"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "pgRNA";gene_id "pgRNA";transcript_id "pgRNA"
+preCore_XGR	XGR_manual	exon	127	3421	.	+	.	gene_name "pgRNA";gene_id "pgRNA";transcript_id "pgRNA";exon_number "1"
+preCore_XGR	XGR_manual	transcript	2907	3421	.	+	.	gene_name "S-HBx";gene_id "S-HBx";transcript_id "S-HBx"
+preCore_XGR	XGR_manual	exon	2907	3421	.	+	.	gene_name "S-HBx";gene_id "S-HBx";transcript_id "S-HBx";exon_number "1"
+preCore_XGR	XGR_manual	transcript	2554	3421	.	+	.	gene_name "LHBx";gene_id "LHBx";transcript_id "LHBx"
+preCore_XGR	XGR_manual	exon	2554	3421	.	+	.	gene_name "LHBx";gene_id "LHBx";transcript_id "LHBx";exon_number "1"
+preCore_XGR	XGR_manual	transcript	2732	3421	.	+	.	gene_name "M-HBx";gene_id "M-HBx";transcript_id "M-HBx"
+preCore_XGR	XGR_manual	exon	2732	3421	.	+	.	gene_name "M-HBx";gene_id "M-HBx";transcript_id "M-HBx";exon_number "1"
+preCore_XGR	XGR_manual	transcript	1114	3421	.	+	.	gene_name "preS1";gene_id "preS1";transcript_id "preS1"
+preCore_XGR	XGR_manual	exon	1114	3421	.	+	.	gene_name "preS1";gene_id "preS1";transcript_id "preS1";exon_number "1"
+preCore_XGR	XGR_manual	transcript	1466	3421	.	+	.	gene_name "preS2";gene_id "preS2";transcript_id "preS2"
+preCore_XGR	XGR_manual	exon	1466	3421	.	+	.	gene_name "preS2";gene_id "preS2";transcript_id "preS2";exon_number "1"
+preCore_XGR	XGR_manual	transcript	1496	3421	.	+	.	gene_name "HbsAg";gene_id "HbsAg";transcript_id "HbsAg"
+preCore_XGR	XGR_manual	exon	1496	3421	.	+	.	gene_name "HbsAg";gene_id "HbsAg";transcript_id "HbsAg";exon_number "1"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "SP01";gene_id "SP01";transcript_id "SP01"
+preCore_XGR	XGR_manual	exon	127	756	.	+	.	gene_name "SP01";gene_id "SP01";transcript_id "SP01";exon_number "1"
+preCore_XGR	XGR_manual	exon	1980	3421	.	+	.	gene_name "SP01";gene_id "SP01";transcript_id "SP01";exon_number "2"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "SP02";gene_id "SP02";transcript_id "SP02"
+preCore_XGR	XGR_manual	exon	127	376	.	+	.	gene_name "SP02";gene_id "SP02";transcript_id "SP02";exon_number "1"
+preCore_XGR	XGR_manual	exon	659	756	.	+	.	gene_name "SP02";gene_id "SP02";transcript_id "SP02";exon_number "2"
+preCore_XGR	XGR_manual	exon	1980	3421	.	+	.	gene_name "SP02";gene_id "SP02";transcript_id "SP02";exon_number "3"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "SP03";gene_id "SP03";transcript_id "SP03"
+preCore_XGR	XGR_manual	exon	127	376	.	+	.	gene_name "SP03";gene_id "SP03";transcript_id "SP03";exon_number "1"
+preCore_XGR	XGR_manual	exon	1980	3421	.	+	.	gene_name "SP03";gene_id "SP03";transcript_id "SP03";exon_number "2"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "SP04";gene_id "SP04";transcript_id "SP04"
+preCore_XGR	XGR_manual	exon	127	397	.	+	.	gene_name "SP04";gene_id "SP04";transcript_id "SP04";exon_number "1"
+preCore_XGR	XGR_manual	exon	659	756	.	+	.	gene_name "SP04";gene_id "SP04";transcript_id "SP04";exon_number "2"
+preCore_XGR	XGR_manual	exon	1980	3421	.	+	.	gene_name "SP04";gene_id "SP04";transcript_id "SP04";exon_number "3"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "SP05";gene_id "SP05";transcript_id "SP05"
+preCore_XGR	XGR_manual	exon	127	397	.	+	.	gene_name "SP05";gene_id "SP05";transcript_id "SP05";exon_number "1"
+preCore_XGR	XGR_manual	exon	1980	3421	.	+	.	gene_name "SP05";gene_id "SP05";transcript_id "SP05";exon_number "2"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "SP06";gene_id "SP06";transcript_id "SP06"
+preCore_XGR	XGR_manual	exon	127	780	.	+	.	gene_name "SP06";gene_id "SP06";transcript_id "SP06";exon_number "1"
+preCore_XGR	XGR_manual	exon	1980	3421	.	+	.	gene_name "SP06";gene_id "SP06";transcript_id "SP06";exon_number "2"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "SP07";gene_id "SP07";transcript_id "SP07"
+preCore_XGR	XGR_manual	exon	127	756	.	+	.	gene_name "SP07";gene_id "SP07";transcript_id "SP07";exon_number "1"
+preCore_XGR	XGR_manual	exon	1211	1294	.	+	.	gene_name "SP07";gene_id "SP07";transcript_id "SP07";exon_number "2"
+preCore_XGR	XGR_manual	exon	1980	3421	.	+	.	gene_name "SP07";gene_id "SP07";transcript_id "SP07";exon_number "3"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "SP08";gene_id "SP08";transcript_id "SP08"
+preCore_XGR	XGR_manual	exon	127	376	.	+	.	gene_name "SP08";gene_id "SP08";transcript_id "SP08";exon_number "1"
+preCore_XGR	XGR_manual	exon	659	756	.	+	.	gene_name "SP08";gene_id "SP08";transcript_id "SP08";exon_number "2"
+preCore_XGR	XGR_manual	exon	1211	1294	.	+	.	gene_name "SP08";gene_id "SP08";transcript_id "SP08";exon_number "3"
+preCore_XGR	XGR_manual	exon	1980	3421	.	+	.	gene_name "SP08";gene_id "SP08";transcript_id "SP08";exon_number "4"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "SP09";gene_id "SP09";transcript_id "SP09"
+preCore_XGR	XGR_manual	exon	127	756	.	+	.	gene_name "SP09";gene_id "SP09";transcript_id "SP09";exon_number "1"
+preCore_XGR	XGR_manual	exon	1773	3421	.	+	.	gene_name "SP09";gene_id "SP09";transcript_id "SP09";exon_number "2"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "SP10";gene_id "SP10";transcript_id "SP10"
+preCore_XGR	XGR_manual	exon	127	397	.	+	.	gene_name "SP10";gene_id "SP10";transcript_id "SP10";exon_number "1"
+preCore_XGR	XGR_manual	exon	659	756	.	+	.	gene_name "SP10";gene_id "SP10";transcript_id "SP10";exon_number "2"
+preCore_XGR	XGR_manual	exon	1773	3421	.	+	.	gene_name "SP10";gene_id "SP10";transcript_id "SP10";exon_number "3"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "SP11";gene_id "SP11";transcript_id "SP11"
+preCore_XGR	XGR_manual	exon	127	780	.	+	.	gene_name "SP11";gene_id "SP11";transcript_id "SP11";exon_number "1"
+preCore_XGR	XGR_manual	exon	1773	3421	.	+	.	gene_name "SP11";gene_id "SP11";transcript_id "SP11";exon_number "2"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "SP12";gene_id "SP12";transcript_id "SP12"
+preCore_XGR	XGR_manual	exon	127	397	.	+	.	gene_name "SP12";gene_id "SP12";transcript_id "SP12";exon_number "1"
+preCore_XGR	XGR_manual	exon	543	756	.	+	.	gene_name "SP12";gene_id "SP12";transcript_id "SP12";exon_number "2"
+preCore_XGR	XGR_manual	exon	1773	3421	.	+	.	gene_name "SP12";gene_id "SP12";transcript_id "SP12";exon_number "3"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "SP13";gene_id "SP13";transcript_id "SP13"
+preCore_XGR	XGR_manual	exon	127	1294	.	+	.	gene_name "SP13";gene_id "SP13";transcript_id "SP13";exon_number "1"
+preCore_XGR	XGR_manual	exon	1980	3421	.	+	.	gene_name "SP13";gene_id "SP13";transcript_id "SP13";exon_number "2"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "SP14";gene_id "SP14";transcript_id "SP14"
+preCore_XGR	XGR_manual	exon	127	756	.	+	.	gene_name "SP14";gene_id "SP14";transcript_id "SP14";exon_number "1"
+preCore_XGR	XGR_manual	exon	1211	3421	.	+	.	gene_name "SP14";gene_id "SP14";transcript_id "SP14";exon_number "2"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "SP15";gene_id "SP15";transcript_id "SP15"
+preCore_XGR	XGR_manual	exon	127	376	.	+	.	gene_name "SP15";gene_id "SP15";transcript_id "SP15";exon_number "1"
+preCore_XGR	XGR_manual	exon	543	756	.	+	.	gene_name "SP15";gene_id "SP15";transcript_id "SP15";exon_number "2"
+preCore_XGR	XGR_manual	exon	1980	3421	.	+	.	gene_name "SP15";gene_id "SP15";transcript_id "SP15";exon_number "3"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "SP16";gene_id "SP16";transcript_id "SP16"
+preCore_XGR	XGR_manual	exon	127	376	.	+	.	gene_name "SP16";gene_id "SP16";transcript_id "SP16";exon_number "1"
+preCore_XGR	XGR_manual	exon	659	780	.	+	.	gene_name "SP16";gene_id "SP16";transcript_id "SP16";exon_number "2"
+preCore_XGR	XGR_manual	exon	1980	3421	.	+	.	gene_name "SP16";gene_id "SP16";transcript_id "SP16";exon_number "3"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "SP17";gene_id "SP17";transcript_id "SP17"
+preCore_XGR	XGR_manual	exon	127	376	.	+	.	gene_name "SP17";gene_id "SP17";transcript_id "SP17";exon_number "1"
+preCore_XGR	XGR_manual	exon	1773	3421	.	+	.	gene_name "SP17";gene_id "SP17";transcript_id "SP17";exon_number "2"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "SP18";gene_id "SP18";transcript_id "SP18"
+preCore_XGR	XGR_manual	exon	127	780	.	+	.	gene_name "SP18";gene_id "SP18";transcript_id "SP18";exon_number "1"
+preCore_XGR	XGR_manual	exon	1211	1294	.	+	.	gene_name "SP18";gene_id "SP18";transcript_id "SP18";exon_number "2"
+preCore_XGR	XGR_manual	exon	1980	3421	.	+	.	gene_name "SP18";gene_id "SP18";transcript_id "SP18";exon_number "3"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "SP19";gene_id "SP19";transcript_id "SP19"
+preCore_XGR	XGR_manual	exon	127	1294	.	+	.	gene_name "SP19";gene_id "SP19";transcript_id "SP19";exon_number "1"
+preCore_XGR	XGR_manual	exon	2584	3421	.	+	.	gene_name "SP19";gene_id "SP19";transcript_id "SP19";exon_number "2"
+preCore_XGR	XGR_manual	transcript	127	3421	.	+	.	gene_name "SP20";gene_id "SP20";transcript_id "SP20"
+preCore_XGR	XGR_manual	exon	127	1294	.	+	.	gene_name "SP20";gene_id "SP20";transcript_id "SP20";exon_number "1"
+preCore_XGR	XGR_manual	exon	1773	3421	.	+	.	gene_name "SP20";gene_id "SP20";transcript_id "SP20";exon_number "2"
+preCore_XGR	XGR_manual	transcript	1466	3421	.	+	.	gene_name "SP21";gene_id "SP21";transcript_id "SP21"
+preCore_XGR	XGR_manual	exon	1466	1947	.	+	.	gene_name "SP21";gene_id "SP21";transcript_id "SP21";exon_number "1"
+preCore_XGR	XGR_manual	exon	2796	3421	.	+	.	gene_name "SP21";gene_id "SP21";transcript_id "SP21";exon_number "2"
+preCore_XGR	XGR_manual	transcript	1466	3421	.	+	.	gene_name "SP22";gene_id "SP22";transcript_id "SP22"
+preCore_XGR	XGR_manual	exon	1466	1947	.	+	.	gene_name "SP22";gene_id "SP22";transcript_id "SP22";exon_number "1"
+preCore_XGR	XGR_manual	exon	2876	3421	.	+	.	gene_name "SP22";gene_id "SP22";transcript_id "SP22";exon_number "2"