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Collateral index. The collateral index was assessed by using the Rentrop grading scales. The Rentrop scoring is based on the following grades: 0 = no filling in any branches of the LAD coronary artery; 1 = filling of only side branches of the LAD coronary artery; 2 = partial filling of the LAD coronary artery; and 3 = complete filling of the LAD coronary artery. The collateral index was scored at weeks 6 (A–D) and 14 (E–H), and the percentages of animals per grade are presented.
