Hi Bastien and others, I did a mapped assembly using the following parameters with MIRA 3.4.0 a long time ago --job=mapping,genome,accurate,solexa --noclipping COMMON_SETTINGS -SB:load_backbone=on:startbackboneusage_inpass=1:backbone_filetype=fasta:abnc=on -MI:stop_on_nfs=no:somrnl=0 SOLEXA_SETTINGS -LR:file_type=fastq I am now trying to get the mapped contigs of my strain(excluding the backbone) from the maf file using the following command ( //www.freelists.org/post/mira_talk/Denovo-versus-mappings-assembly-with-Mira,1 ). convert_project -f maf -t fasta mira_out.maf mynewresults I get the following unpadded files - XXX_default.unpadded.fasta XXX_StrainX.unpadded.fasta XXX_ReferenceStrain.unpadded.fasta XXX_AllStrains.unpadded.fasta I can figure out that ReferenceStrain is the backbone. What is the difference between the three other files? They have very similar characteristics. Thanks Best, Surya ----------------------------------------------------- Surya Saha Department of Plant Pathology and Plant-Microbe Biology Cornell University, NY, USA http://www.linkedin.com/in/suryasaha Twitter: @SahaSurya