plasma renin activity ( pra ) , serum angiotensin-converting enzyme ( ace ) , plasma factor viiir : ag , and plasma beta-thromboglobulin ( btg ) were determined before and after handgrip in subjects with borderline ( n = 8 ) and established ( n = 11 ) hypertension and in age-matched normal volunteers ( n = 10 ) .
C0229671
serum
C0032105
plasma