I have some bam files from Neandertals I downloaded from UCSC. I want to first merge them and then convert to VCF file. but when I search for @RG in bam files to see if they are from the same library, it shows they don't have @RG. I use this command to find @RG in bam files:
samtools view -H SLFeld1.hg19.bam | grep "^@RG" > RG_SLFeld
why these bam files don't have @RG?
thanks a lot