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Description
Jia YF, Wininger K, Peyton L, Ho AM, Choi DS

The National Library of Medicine says these supplements contain a yellow or yellowish-orange powder

Development 121 , 18451854 (1995)

While the naturally occurring tetrapeptide consists solely of L-amino acids, a good research direction would be to evaluate the pharmacological properties of the other seven stereoisomers in a comparative study
