Phytanic acid levels in human and great ape red blood cells. Box plots representing the percentage of phytanic acid relative to total fatty acids from red blood cells are provided. Median, quartile 1, quartile 3, minimum, and maximum values are provided. In Panels A and B, the species (Hsa: human; Ptr: chimpanzee; Ppa: bonobo; Ggo: gorilla; Ppy: orangutan), human diet (V: vegan, W: western), and number of individuals successfully analyzed is provided on the X-axes. Blood donor sex (M: male, F: female) is provided in Panel B.