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CD47 limits tube formation by endothelial cells from aged mice. Representative images (A,B) and the quantification (C) of total tube length, total branching length and total number of nodes of arterial ECs from aged male wild-type (WT) and CD47-null mice. Error bars represent the mean ± SEM. An unpaired t-test was performed with ** p < 0.01, *** p < 0.001.
