Circulating nitric oxide (NO) levels in juvenile male veiled chameleons collected immediately before and two days after (data points offset for clarity) dermal biopsies performed during the carotenoid supplementation period (X
in Week 14 and X
in Week 20 of the study). Circulating NO levels decreased from pre- to post-wound, with a much larger drop in X1 than in X2. In general, there were no detectable treatment effects and NO levels decreased as the chameleons aged. Points represent mean values with standard errors calculated from raw data.