net renal tubular secretion of endogenous beta-amino acids ( taurine , beta-alanine , beta-aminoisobutyric acid ) and their endogenous analogue ( l-cysteic acid ) was revealed in the olive sea snake , aipysurus laevis , and in the garter snake , thamnophis sirtalis , by renal clearance methods .
C0002520
amino acids
C0000392
beta-alanine