Fig. 1

Mean (±SEM) carotenoid content in serum of rhesus macaque of different origin in a (n = 4 Chinese, n = 3 Indian) and b subset used for gene expression analysis (n = 2 for each origin). Lutein (cis+trans) and zeaxanthin (trans, no cis present) concentrations (nmol/L) were greater in monkeys of Indian origin vs. Chinese (Fig. 1a. *p < 0.09, Student’s t test)