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Department of Animal Science, University of Illinois, Urbana, IL 61801
Chick growth assays were used to evaluate the efficacy of poly-L-methionine and DL/LD methionylmethionine (a 50:50 mixture of D-Met-L-Met and L-Met-D-Met). The polypeptide possessed no bioefficacy whatever, probably due to its extreme insolubility. The dipeptide of methionine exhibited growth-promoting ability equal to that of DL-methionine itself.
KEY WORDS: methionine DL/LD methionylmethionine poly-L-methionine
1 To whom reprint requests should be addressed.
Manuscript received 9 December 1981.
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