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The l form is more widely occurring in nature, but the d form occurs in some special contexts, such as the bacterial capsule and cell walls of the bacteria (which produce it from the l form with the enzyme glutamate racemase) and the liver of mammals
Twenty l of filtered MTT solution (5 mg/ml in PBS) was added to each well, after which the plates were incubated for an additional 4 h
Epitalon, a synthetic tetrapeptide, emulates the natural peptide Epithalamin from the pineal gland, offering a scientific breakthrough in understanding and potentially extending the human lifespan
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