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ERROR MESSAGE: SAM/BAM file genome_110616_SN365_A_s_7_seq_GQJ-1.pe.bam is malformed: SAM file doesn't have any read groups defined in the header. The GATK no longer supports SAM files without read groups

i am very new to GATK and i was trying to invoke the readcount command and i got the error above what is read groups.

thank you

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