elastin stained van giesen horizontally cut sections the sections were obtained from i the aorta at the level of the renal artery ii the common iliac artery at the level of bifurcation and iii the external iliac artery just above the inguinal ligament the area of intimal hyperplasia and total vessel area were determined by morphometry the percentage of intimal hyperplasia was expressed as follows equ1 single determinations were made on three segments of each aorta and the two iliac arteries of each animal the percentage of intimal hyperplasia was determined as the mean of the two closest measurements of each vessel in the control group the myointimal hyperplasia was greatest in the external iliac artery where the percentage of intimal hyperplasia was 34 7 u00b1 11 5 female rabbits and 30 0 u00b1 6 3 male rabbits the percentage of intimal hyperplasia appeared to decrease with increasing vessel size as the common iliac artery and the aorta showed percentages of intimal hyperplasia of 23 7 u00b1 4 9 and 18 8 u00b1 2 9 respectively female rabbits and 23 0 u00b1 5 8 and 22 0 u00b1 6 5 respectively male rabbits the percentage of inhibition of myointimal hyperplasia by angiopeptin 20 u03bcg kg d was significant and similar for all three vessel segments about 41 33 and 43 for the external iliac artery common iliac.