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The number of capillaries in each group as detected by immunohistochemistry. The numbers of capillaries in the intramyocardial injection (IMI) group was higher than that in the other 3 groups (p<0.01, p<0.01 and p=0.028), the microvessel density in the targeted microbubble delivery (TMB) group was higher than that in the non-TMB group.
