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1. Balish, E. and Shapiro, S.K. Methionine biosynthesis in Escherichia coli: induction and repression of methylmethionine (or adenosylmethionine):homocysteine methyltransferase. Arch. Biochem. Biophys. 119 (1967) 62-68. [PMID: 4861151]

2. Shapiro, S.K. Adenosylmethionine-homocysteine transmethylase. Biochim. Biophys. Acta 29 (1958) 405-409.

3. Shapiro, S.K. and Yphantis, D.A. Assay of S-methylmethionine and S-adenosylmethionine homocysteine transmethylases. Biochim. Biophys. Acta 36 (1959) 241-244.
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