although prolonged perfusion of glands with dinitrophenol ( 0.8 mm for 20-30 min ) caused a variable but net inhibition of unidirectional uptake , it markedly enhanced the tracer efflux of l-leucine , l-phenylalanine , l-tyrosine and the basic amino acid l-lysine .
C0301714
basic amino acid
C0024337
lysine