diff --git "a/src/RNAseq_sen1\342\210\206.nf" "b/src/RNAseq_sen1\342\210\206.nf"
index eda4e8a0afb8fcb5336f4acc2db0e1ec8adfe754..7d3fb5ab13f7db7218f690a174acd004a6e814df 100644
--- "a/src/RNAseq_sen1\342\210\206.nf"
+++ "b/src/RNAseq_sen1\342\210\206.nf"
@@ -36,3 +36,43 @@ process adaptor_removal {
   ${reads[0]} ${reads[1]} > ${pair_id}_report.txt
   """
 }
+
+/*
+* urqt :
+* Imputs : fastq files
+* Output : fastq files
+*/
+/*                      quality trimming                                     */
+
+/*
+* for paired-end data
+*/
+
+params.fastq = "$baseDir/data/fastq/*_{1,2}.fastq"
+
+log.info "fastq files : ${params.fastq}"
+
+Channel
+  .fromFilePairs( params.fastq )
+  .ifEmpty { error "Cannot find any fastq files matching: ${params.fastq}" }
+  .set { fastq_files }
+
+process trimming {
+  tag "${reads}"
+  cpus 4
+  publishDir "results/fastq/trimming/", mode: 'copy'
+
+  input:
+  set pair_id, file(reads) from fastq_files_cut
+
+  output:
+  set pair_id, "*_trim_R{1,2}.fastq.gz" into fastq_files_trim
+
+  script:
+"""
+UrQt --t 20 --m ${task.cpus} --gz \
+--in ${reads[0]} --inpair ${reads[1]} \
+--out ${pair_id}_trim_R1.fastq.gz --outpair ${pair_id}_trim_R2.fastq.gz \
+> ${pair_id}_trimming_report.txt
+"""
+}