Analyses of the selection on chromosome 2 among rumpless Araucana, rumpless Piao, and 8 WT chicken populations. The target region for Piao chicken is pointed out with the green star. Different selection signals can be found between Araucana/WT (A) and Piao/WT (B) along the chromosome and also between Araucana and Piao at the target interval (C).