diff --git a/src/RNASeq.nf b/src/RNASeq.nf
index e8f6bb458804bce7ab9237df604a1455e8836db5..c130936426fd3e557cd15672b24faff21c3de5f9 100644
--- a/src/RNASeq.nf
+++ b/src/RNASeq.nf
@@ -38,66 +38,3 @@ process adaptor_removal {
   """
 }
 
-/*                      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: ${params.fastq}" }
-  .set { fastq_files }
-
-process trimming {
-  tag "$pair_id"
-  publishDir "results/fastq/trimming/", mode: 'copy'
-
-  input:
-  set pair_id, file(reads) from fastq_files
-
-  output:
-  file "*_trim_R{1,2}.fastq.gz" into fastq_files_trim
-
-  script:
-  """
-  cutadapt -q 20,20 \
-  -o ${pair_id}_trim_R1.fastq.gz -p ${pair_id}_trim_R2.fastq.gz \
-  ${reads[0]} ${reads[1]} > ${pair_id}_report.txt
-  """
-}
-
-/*
-* for single-end data
-*/
-
-params.fastq = "$baseDir/data/fastq/*.fastq"
-
-log.info "fastq files : ${params.fastq}"
-
-Channel
-  .fromPath( params.fastq )
-  .ifEmpty { error "Cannot find any fastq files matching: ${params.fastq}" }
-  .set { fastq_files }
-
-process trimming {
-  tag "$reads.baseName"
-  publishDir "results/fastq/trimming/", mode: 'copy'
-
-  input:
-  file reads from fastq_files
-
-  output:
-  file "*_trim.fastq.gz" into fastq_files_trim
-
-  script:
-  """
-  cutadapt -q 20,20 \
-  -o ${reads.baseName}_trim.fastq.gz \
-  ${reads} > ${reads.baseName}_report.txt
-  """
-}