FIGURE 2 Genome landscape of Corbicula fluminea. From outer to inner circles: a: marker distribution on 18 chromosomes at the Mb scale; b: LARD distribution on each chromosome; c: PLE distribution on each chromosome; d: gene distribution on each chromosome; e: GC content within a 1-Mb sliding window; yellow lines in the inner circle indicate gene blocks on the forward direction strand, and red lines indicate gene blocks on the reverse direction strand.