And that creates a positive charge on that sulfur as seen in this particular diagram. So this is the product of step one. We call it S adenosyl methionine, or simply sam. Now, what's the importance of this sulfur and the positive charge on the sulfur? Well, this is basically a relatively unstable arrangement because we have a positive charge on this relatively electronegative sulfur atom. And so what that means is this molecule is a very good methyl donor.