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Phytochem Rev 16:12271252 Nascimento LBS, Leal-Costa MV, Menezes EA, Lopes VR, Muzitano MF, Costa SS, Tavares ES (2015) Ultraviolet-B radiation effects on phenolic profile and flavonoid content of Kalanchoe pinnata
At position fifteen, the amino acid histidine (His) is replaced with a modified amino acid called D-Phenylalanine (D-Phe)
Even with the right diet, the elderly can experience difficulty extracting the right nutrients from their foods, and this can lead to a vitamin deficiency
Without this, biomarker-driven therapeutics development is not possible