a colorimetric method was developed for the direct chemical assay of human carboxypeptidase a ( carboxypolypeptidase ; ec 3.4.12.2 ) with angiotensin converting enzyme-like activity in serum or plasma , with the substrate analogue glycyl-l-histidylglycine and the angiotensin converting enzyme substrate angiotensin i ( a-i ) .
C0229671
serum
C0032105
plasma