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Islands of speciation are distinct from genomic islands. (A) Different colors denote different allelic variants at a chromosomal locus. (B) Divergence between species (left y-axis) is often measured as the number of fixed nucleotide substitutions between species, or a measure, such as the fixation index (FST); metagenomic coverage (right y-axis) is simply the number of metagenomic sequencing reads that align at a given position of the reference genome.
