glutathione is synthesized from calcium in Higher Plants: Biosynthesis and Physiological Mechanisms During Heat and Drought-Induced Oxidative Stress Glutathione Metabolism - an overview

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For example, large neutral amino acid transporter 1 (LAT1)-utilizing amino acid prodrugs have been shown to bind to LAT1 in high affinity but the transport rates into the cells were dramatically lower compared to endogenous substrates, L-amino acids (78, 79)

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