Forestomach papillomas in flaky skin and steel-Dickie mutant mice.

Gastric papillomas were diagnosed in flaky skin (fsn/fsn) and steel-Dickie (Sl/Sld) mutant mice but not littermate controls. Both mutants suffer from severe anemia of differing causes. Immunohistochemical screening and Southern blot analyses failed to detect any evidence of a papillomavirus in the gastric lesions. Phenotypic expression of the fsn and Sld mutant genes may play an essential role in the spontaneous development of forestomach papillomas in these mouse mutants.