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Hum Mol Genet 18 , 40464053, (2009)

A tendon fibroblast study reported that BPC-157 increased growth hormone receptor expression in tendon fibroblasts at both mRNA and protein levels

Heme oxygenase-1 prevents superoxide anion associated vascular smooth muscle growth and decreases circulating endothelial cells in a rat model of balloon injury and restenosis in diabetes mellitus

With age, endogenous synthesis decreases and needs increase (slower recovery, sarcopenia)

Interestingly, they observed a lack of correlation between quantification results from two biopsies collected from the same individual and time point [36]