HPLC elution profile of 125I-labelled antiotensins in femoral artery tissue (22 mg) and incubation fluid (100 μl) obtained after incubation of femoral artery rings at 37°C for 60 min in 1 ml incubation medium containing 100,000 c.p.m. 125I-Ang I or 125I-Ang II. The retention times of 125I-labelled standards are indicated by arrows at the top (1, 125I-tyrosine; 2, 125I-Ang-(1 – 7); 3, 125I-Ang III; 4, 125I-Ang-(4-8); 5, 125I-Ang II; 6, 125I-Ang IV, 7, 125I-Ang-(2 – 10); 8, 125I-Ang I).