Table 2  Sex-biased gene expression across Z chromosome strata
StratumEstimated age (MYA)No. of expressed genesMale-bias (log2 male FPKM−female FPKM) (unlogged male FPKM−female FPKM)
1133330.86
(2.10)
2a671540.64
(1.80)
2a73410.69
(1.86)
2ba631130.63
(1.77)
3461010.33
(1.51)
  • a Genes from the male hypermethylated region excluded.