uroporphyrinogen III + S-adenosyl-L-methionine = precorrin-1 + S-adenosyl-L-homocysteine + H(+)
uroporphyrinogen iii + s-adenosyl-l-methionine = precorrin-1 + s-adenosyl-l-homocysteine + h(+)
uroporphyrinogen III + S-adenosyl-L-methionine = precorrin-1 + S-adenosyl-L-homocysteine + H(+)
uroporphyrinogen iii + s-adenosyl-l-methionine = precorrin-1 + s-adenosyl-l-homocysteine + h(+)