I want to call SNPs in GATK using the BAM file produced by GS Reference mapper , bu the problem with BAM file is it does not contain the read group so how to add read group in the bam file of 454 sequencing data and whether or not PICARD and GATK can be used to call SNPs from 454 sequencing data. Till now I was using samtools but now my task is to compare the output of Samtools and GATK. ANy help will be appreciated
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