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IHC analysis for the expression of CD31 in AMI mouse hearts of different groups (magnification ×200). CD31-positive endothelial cells in C57BL/6CX3CR1-/- AMI mice following MSC transplantation were compared on days 3 and 21. ∗p < 0.05 vs. the corresponding low-NR4A1 expression level group. Abbreviations: NR4A1: nuclear receptor subfamily 4 group A member 1.
