Fig. 2

Mean xanthophyll concentrations (ng/mg protein) ±SEM in prefrontal cortex (PFC), cerebellum (CER), and striatum (STR) of rhesus macaques of different origin. Lutein concentrations were greater in monkeys of Indian origin compared to Chinese in PFC and CER in a all monkeys analyzed (*p < 0.1, Student’s t test, n = 5 Indian, n = 4 Chinese) and b in subset of monkeys selected for gene expression analysis (**p < 0.05, Student’s t test, n = 3 per group). Zeaxanthin concentrations were greater in monkeys of Indian origin compared to Chinese in PFC and CER in c all monkeys analyzed (n = 9) and d in subset of monkeys selected for gene expression analysis (n = 6), **P < 0.05 for both, Student’s t test