Product cited in:
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Werner, Di Rocco, Prikhojan et al.: "COMT-dependent protection of dopaminergic neurons by methionine, dimethionine and S-adenosylmethionine (SAM) against L-dopa toxicity in vitro." in: Brain research, Vol. 893, Issue 1-2, pp. 278-81, 2001 (PubMed).