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novel class of mouse mammary tumor virus-related dna sequences found in all species of mus, including mice lacking the virus proviral genome.mice in breeding colonies of feral mus musculus brevirostris (azrou, morocco), m. m. musculus (studenec, czechoslovakia), and m. m. molossinus (fukuoka, japan) were found to lack the mouse mammary tumor virus (mmtv-alpha) proviral genome in their germ line. mmtv-alpha proviral genomes have been found in all inbred strains of m. musculus by using high-stringency nucleic acid hybridization conditions. we conclude that feral mice in these colonies are heterozygous for a limited number of mmtv-alpha ...19826287466
[hybridization between mus musculus l. and mus spretus lataste under laboratory conditions (author's transl)].2 species of mice mus musculus brevirostris and mus spretus are sympatric in southern france and reproductively isolated. however, under laboratory conditions, they breed and give fully viable f 1 hybrids. this indicates that premating isolating mechanisms probably occur in nature and have yet to be investigated. moreover, it now enables us to introduce new genetical markers in laboratory strains.1978720505
evidence for the presence of two sympatric species of mice (genus mus l.) in southern france based on biochemical genetics.populations of mice established outdoors as well as indoors have been investigated at 24 loci using starch gel electrophoresis. two reproductively isolated groups are recognized, one of which is referable to a house mouse subspecies, mus musculus brevirostris, and the other to a different species. mus spretus, contrary to the view of schwarz and schwarz that only one species of mus is present in the mediterranean basin. the genetic distance between these two groups is larger than between any pai ...1978678291
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