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(a) Representative digital angiograms of bilateral limb vasculature in the arterial phase performed 35 days after hindlimb ischemia induction. (b) Angiographic score on post-operative day 35 was expressed as a ratio of collateral number in the ischemic limb to that in the non-ischemic limb. N = 5–10. * denotes p<0.01 versus control and Angpt-1.
