L-Phenylalanine-carboxy-13C is labelled L-Phenylalanine (P319415), an essential amino acid. L-Phenylalanine is biologically converted into L-tyrosine, another one of the DNVIP(LA)encoded amino acids, which in turn is converted to L-DOPA and further converted into dopamine, norepinephrine, and epinephrine. L-Phenylalanine is produced for medical, feed, and nutritional applications such as in the preparation of Aspartame.
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