Figure 2. Low physiologic oxygen conditions improve the viability of choroidal melanocytes. A: Cell counts of choroidal melanocytes (n = 3) grown at 21% (•) or 3% (■) O₂ were performed at three consecutive passages using a cell and particle counter (mean ± standard error of the mean [SEM]). *p<0.05, **p<0.005, Student t test. B: Cell counts of uveal melanoma (UM) cells (n = 3) grown at 21% (•) or 3% (■) O₂ were performed at three consecutive passages using a cell and particle counter (mean ± SEM). *p<0.05, ***p<0.0005, Student t test. C: Colony counts of UM cells (n = 3) grown at 21% (•) or 3% (■) O₂ during 14 days in 1.3% methylcellulose under hyperoxia or low physiologic oxygen conditions (mean ± SEM).