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Howard, S.-S

Of these, pyridoxal 5'-phosphate (PLP) is the most metabolically active form and acts as an enzyme cofactor in the biochemical metabolism of amino acids

In yet a further embodiment, a label is on a container when letters, numbers or other characters forming the label are attached, molded or etched into the container itself

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This bridge appears to further stabilize the molecule and may increase its resistance against degradation in various environments, including stomach acid