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Young genes evolve more rapidly. (A,B) ω values decrease with age in both the dS ranges, indicating that young genes evolve rapidly and become more constrained over time. The ω values of 1:1 orthologs between P. pacificus and P. exspectatus of Age class ix (C) and Age classes i–viii (D) in 5-Mb windows show that young genes are less constrained irrespective of the chromosomal location. For comparison, in both C and D, corresponding windows on each chromosome have the same color.
