on the fetal side the maximal uptake ( u ( max ) ) determined at tracer concentrations was high for the short-chain neutral amino acid alanine ( 76 % ) and the long-chain neutrals , leucine ( 75 % ) , phenylalanine ( 90 % ) and tyrosine ( 82 % ) and for the basic amino acid lysine ( 65 % ) .
C0301714
basic amino acid
C0024337
lysine