This is because a related chemical, L-carnitine, seems to interfere with thyroid hormone
Herein, we demonstrate that mutations applied to the activity controller residues (Asn240 and Leu244) and to the gatekeeper residue (Phe260) inhibit the monophenolase activity of jr PPO1 and convert the plant TYR ( jr PPO1) into a CO
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Their ability to cross the bloodbrain barrier and a favorable safety profile make them attractive adjuncts in personalized longevity programs