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Equal numbers of growth arrested MCs were incubated with media containing either buffer alone (control), hemin (5μM), zinc protoporphyrin (ZnP, 100 μM) or hemin + ZnP. Sixty minutes later, aliquots of vehicle with or without EGF (10 ng/ml) were added to each variable. After 48 hours, number of cells in each well was counted. Rsults (means ± SEM) are from 3 sets of experiments, each carried out in quadruplicate. Results were analyzed by a Newman-Keuls multiple-range test
