[Proportions of various types of collagen present in medium-sized arteries].

A technique using alternatively dithiothreitol reduction, sonication and pepsin digestions permits the extraction of 75% of the insoluble collagen from human common iliac arteries. The pattern of the collagen types obtained by acrylamide gel electrophoresis is far different from that of the aortic wall: type I averages 44 +/- 14% of the total, type III 48.5 +/- 14% and a supplementary fraction, probably belonging to type V, 9 +/- 5% of the total in females and 6 +/- 2% in males.