%0 Journal Article %T Insight into the polar reactivity of the onium chalcogen analogues of S-adenosyl-L-methionine. %A Iwig, David F %A Booker, Squire J %J Biochemistry %V 43 %N 42 %P 13496-509 %@ 0006-2960 %D 2004-12-02 %~ DeepDyve