TY - SER AU - Nakayama,Ichiro AU - Foresti,Fausto AU - Tewari,Rita AU - Schartl,Manfred AU - Chourrout,Daniel TI - Sex chromosome polymorphism and heterogametic males revealed by two cloned DNA probes in the ZW/ZZ fish Leporinus elongatus KW - Anostomidae KW - Chromosomes ER -