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. 2012 Jul 4;28(16):2097–2105. doi: 10.1093/bioinformatics/bts330

Fig. 1.

Fig. 1

The top sequence represents the reference genome, with many individual reads mapped to the sequence beneath. The left highlighted column illustrates a homozygous substitution and the right highlighted column illustrates a heterozygous substitution. Two green reads are same sequence, which means the read can be mapped to multiple position. Consequently the origination is ambiguous