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Is it normal that there are more non-synonymous SNPs Than synonymous SNPs in mouse cell lines?

I analyzed whole exome seq data from 5 mouse cell lines without matched normal. I used bwa -> GATK realignment -> GATK recalibration -> Varscan2 -> annovar for variant calling. I used GRCm38 as the reference genome. Three of these cell lines have much more (almost twice) non-synonymous SNPS than synonymous SNPs. Is that normal? I would expect more synonymous SNP in the data. The remaining two cell lines have more synonymous SNPs.

Thank you so much.

whole exome seq snp mouse cell line

It is very much normal !

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