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Sixteen specimen of Microtus (Terricola) collected in subalpine meadows of the Pindos and Iti mountains were karyotyped. All 11 animals from the Pindos mountain had the same karyotype with 2n = 42, NF = 42. The individuals collected on Iti mountain had a karyotype with 2n = 40, NF = 42 characterized by a large pair of metacentric chromosomes. The two karyotypes were closely related and one might have...