Accelerated growth of bovine preantral follicles in vitro after stimulation with both FSH and BMP-15 is accompanied by ultrastructural changes and increased atresia

Passos, M.J.; Vasconcelos, G.L.; Silva, A.W.B.; Brito, I.R.; Saraiva, M.V.A.; Magalhães, D.M.; Costa, J.J.N.; Donato, M.A.M.; Ribeiro, R.P.; Cunha, E.V.; Peixoto, C.A.; Campello, C.C.; Figueiredo, J.R.; van den Hurk, R.; Silva, J.R.V.