passages.id: split_1_test_953_passage
passages.type: progene_text
passages.text: During phase II , 13 pigs were randomized to receive either a collagen - impregnated Dacron graft ( n = 6 ) or a cryopreserved allograft ( n = 7 ) in the ascending aortic position only and infusion of S aureus 24 hours after the operation .