title: Melanomas in Xiphophorus variatus (Pisces, Poeciliidae) in the absence of hybridization.
mesh_terms: D000483:Alleles; D000818:Animals; D003433:Crosses, Genetic; D005260:Female; D005393:Fish Diseases / Q000235:genetics*; D005399:Fishes; D005796:Genes; D008040:Genetic Linkage; D005838:Genotype; D006824:Hybridization, Genetic; D008297:Male; D008545:Melanoma / Q000235:genetics / Q000662:veterinary*; D010641:Phenotype; D010858:Pigmentation; D012730:Sex Chromosomes