title: On the chromosomic polymorphism of Rattus rattus L. A study on West-European populations.
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells; D002875:Chromosomes; D004171:Diploidy; D004739:England; D005602:France; D007558:Italy; D007621:Karyotyping; D011110:Polymorphism, Genetic; D051381:Rats / Q000145:classification*; D013557:Switzerland