Evidence that growth factors IGF-I, IGF-II and EGF can stimulate nuclear maturation of porcine oocytes via intracellular protein kinase A Alexander V. Sirotkin, Janka Dukesová, Alexander V. Makarevich, Aloiz Kubek and Jozef BullaReprod. Nutr. Dev., 40 6 (2000) 559-569DOI: https://doi.org/10.1051/rnd:2000137