Conservation of avian germplasm by xenogeneic transplantation of spermatogonia from sexually mature donors - Pereira, Ricardo José Garcia; Napolitano, Angelo; Garcia-Pereira, Fernando L; Baldo, Caroline F; Suhr, Steven T; King, Louis E; Cibelli, Jose B; Karcher, Darrin M; McNiel, Elizabeth A; Perez, Gloria I (Stem Cells and Development, 2013)