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The contrast agent signal intensity ratio of the anterior wall to the posterior wall in the control and gene-transfected animals. p<0.01 indicates that the contrast agent signal intensity ratio of the anterior wall to the posterior wall in the targeted microbubble delivery (TMB) and intramyocardial injection (IMI) group was higher than that of the non-TMB group; no differences were observed between the TMB and IMI group.
