Fig. 1From: The absence of reproductive isolation between non-sister and deeply diverged mitochondrial lineages of the black-throated tit (Aegithalos concinnus) revealed by a multilocus genetic analysis in a contact zoneSampling sites for the current study and the geographic distribution of the mitochondrial ND2 haplotypes. White indicates haplotypes belonging to lineage A, whereas black refers to those of lineage B-CBack to article page