Search for: [Description = "Protein polymorphism in 767 yellow\-necked mice Apodemus flavicollis \(Melchior, 1834\), was studied in spring and autumn during five years in Białowieża National Park, Eastern Poland. Two peaks and two declines of population number were observed, and population density varied from 3 to 63 inds\/ha. Twenty three loci of proteins were studied, 4 of them were polymorphic\; and mean heterozygosity of the studied population was H = 0.057."]