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If you have multiple vials, use the oldest ones first

Nitric oxide in the pathogenesis of vascular disease

To assess the half maximal inhibitory concentration (IC50) of FOXO4-DRI on the serum limitation-induced senescent fibroblast and the non-senescent control fibroblast, the fibroblast viability in the 2% FBS induced senescent fibroblast and 10% FBS cultured non-senescent control fibroblast with increasing concentrations of FOXO4-DRI was detected, and the cell viability curves were showed in Supplementary Fig

Try to determine the source of the contamination, and whether its an isolated incident or a continual problem