passages.id: split_1_test_957_passage
passages.type: progene_text
passages.text: In phase II , graft infection was present in 38.5 % ( 5 / 13 ) of animals , with only 16.7 % ( 1 / 6 ) in the collagen - impregnated Dacron graft group and 57.2 % ( 4 / 7 ) in the cryopreserved allograft group becoming infected .