Distribution of the nearest neighbors of the 125 putative recombinant genes in the ON2010 strain.

When identical distance was observed in different groups for a gene, the nearest neighbor was assigned to the group most closely related to the B1 group.

当某一基因在不同组别中观测到相同距离时，将最近邻（nearest neighbor）分配至与B1组亲缘关系最为紧密的组别。