Effect of growth factors on proliferation, apoptosis and protein kinase A expression in cultured porcine cumulus oophorus cells Alexander V. Sirotkin, Janka Dukesová, Juraj Pivko, Alexander V. Makarevich and Alojz Kúbek Reprod. Nutr. Dev., 42 1 (2002) 35-43 DOI: 10.1051/rnd:2002004