Isolation and characterization of eight pregnancy-associated glycoproteins present at high levels in the ovine placenta between day 60 and day 100 of gestation Bouchra El Amiri, Benoit Remy, Noelita Melo de Sousa and Jean-François BeckersReprod. Nutr. Dev., 44 3 (2004) 169-181DOI: https://doi.org/10.1051/rnd:2004025