EOG89KJ5D GO:0008898 38/128 S-adenosylmethionine-homocysteine S-methyltransferase activity molecular_function "Catalysis of the reaction: S-adenosyl-L-methionine + L-homocysteine = S-adenosyl-L-homocysteine + L-methionine." [EC:2.1.1.10, GOC:BHF, GOC:dph]