D. The expression of human TGF-β1 in cultured AT-MSCs and wound tissues of WT or CD18-/- wounds received AT-MSCs injection was quantified by qPCR with primers specifically amplify human TGF-β1, and normalized on the numbers of MSCs in each condition Data are expressed as mean ± SEM, n = 8 wounds (2 wounds x 4 mice) per time point 