1. The role of the visceral yolk sac in mediating protein utilization by rat embryos cultured in vitro;Freeman;J. Embryol. Exp. Morphol.,1981
2. Evidence that protein ingested by the rat visceral yolk sac yields amino acids for synthesis of embryonic protein;Freeman;J. Embryol. Exp. Morphol.,1983
3. Nutrient requirements of rat embryos undergoing organogenesis in vitro;Cockroft;J. Reprod. Fert.,1979
4. The effect of teratogenic antiserum on yolk sac function in rat embryos cultured in vitro;Freeman;J. Embryol. Exp. Morphol.,1982
5. Inhibition of proteolysis in rat yolk sac as a cause of teratogenesis. Effects of leupeptin in vitro and in vivo;Freeman;J. Embryol. Exp. Morphol.,1983