Figure 3. Neighbor joining tree of the 22 alleles obtained from 32 nestlings of the Chinese egret.

The two trees are constructed with sequences from 5’ UTR to exon 3 (A) and only exons (B), respectively by using the MEGA 4.0 software program. A Barn Owl MHC class II sequence, TyalDAB1 (accession numbers EU442606), served as the outgroup.