TY  - SER
AU  - Almeida de Toledo,Lurdes F.
AU  - Foresti,Fausto
AU  - Pèquignot,E.V.
AU  - Daniel Silva,Maria de Fátima Z.
TI  - XX:XY sex chromosome system with X heterochromatinization: an early stage of sex chromosome differentiation in the Neotropic electric eel Eigenmannia virescens
ER  -