Dear Bastien, Is there a way of disabling the masking (conversion to the n) of the first base in every solexa read (miseq), other then telling MIRA that they come from 454? The reads are preprocessed by my fastq import/filter tool and have all detectable crap removed/clipped, so only good sequence should remain. I've tried setting the following parameters: -CL:cbse=no -CL:c3pp=no:ckar=no But it still changes the first base in every read to n, and sets quality to 0. And as a results all reads in the resulting ace file doesn't match the phd.ball files, and the consed (v22) is complaing... (and doesn't show any read quality data). The reads were saved in the *.fasta, *.fasta.qual and *.xml files before inputing into the mira. -- Best regards, Markiyan mailto:ms587@xxxxxxxxxxxxxxxxxx -- You have received this mail because you are subscribed to the mira_talk mailing list. For information on how to subscribe or unsubscribe, please visit http://www.chevreux.org/mira_mailinglists.html