S-methyl-L-methionine + L-selenocysteine => Se-methyl-L-selenocysteine + L-methionine + H(+)
s-methyl-l-methionine + l-selenocysteine => se-methyl-l-selenocysteine + l-methionine + h(+)
S-methyl-L-methionine + L-selenocysteine => Se-methyl-L-selenocysteine + L-methionine + H(+)
s-methyl-l-methionine + l-selenocysteine => se-methyl-l-selenocysteine + l-methionine + h(+)