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European journal of clinical chemistry and clinical biochemistry : journal of the Forum of European Clinical Chemistry Societies • 1992 | View Paper
“ Guanidoacetic acid or glycine in combination with methionine resulted in increased food efficiency and body/tumor ratios, a response which suggests a specific role for these acids.”
“The methylation of guanidoacetic acid by liver slices is accelerated by methionine ; choline, under these conditions, exerts no significant accelerating effect (1).”