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Time-dependent increase in NO• in supernatants of primmorph culture. The 6-day-old aggregates were incubated for 0, 3, 12, or 24 hr either in the dark or in the light. Subsequently, the culture supernatants were collected and nitric oxide (NO) was quantified by the Griess detection system. Results are means (± SD) from six separate experiments; *p<0.05.
