In addition, the Liver - Chip maintained stable physiologic levels of key hepatic functions, such as albumin secretion, urea secretion, and expression of CYP450s drug metabolizing enzymes. (emulatebio.com)
But ScienceInsider guesses that he was referring to a single nucleotide polymorphism (SNP) called rs762551 that modulates a caffeine metabolizing enzyme in the liver. (sciencemag.org)
«The stability of the global lipidome with age, diet and over time is unknown, and the influence of external factors such as epigenetic control of lipid metabolizing enzymes could be considerable.» (sciencedaily.com)