Smith R M, Jarrett I G, King R A, Russell G R
Biol Neonate. 1977;31(5-6):305-10. doi: 10.1159/000240980.
With three exceptions amino acids were retained by the fetal lamb from the maternal circulation in proportions appropriate for the synthesis of whole blody protein. Only glutamate, aspartate and serine, amino acids involved in the synthesis of nucleic acids, seemed to be produced by the fetus itself.
除了三种氨基酸外，胎羊从母体循环中保留的氨基酸比例适合于合成全身蛋白质。似乎只有谷氨酸、天冬氨酸和丝氨酸（参与核酸合成的氨基酸）是由胎儿自身产生的。
