title: A congenic chicken line differing at IgM allotype.
mesh_terms: D000818:Animals; D001947:Breeding; D002645:Chickens / Q000276:immunology*; D007126:Immunoglobulin Allotypes; D007075:Immunoglobulin M
chemical_list: D007126:Immunoglobulin Allotypes; D007075:Immunoglobulin M