Table 1. Haplotypes and polymorphic positions in the Y-chromosomal marker (intron SMCY 11; 730 bp) in the studied transects across contact zones in M. arvalis.

Haplotype	N	133	177	295	336	405
Western Y1	42	C	T	C	G	T
Italian Y	51	T	A	C	G	T
Central Y1	192	C	T	T	—	A

The position of the substitutions and insertion/deletion are indicated in the first row. The number of individuals sequenced per haplotype is displayed under N.