So we see that the active side contains a cysteine. And this is the S atom that is part of the side chain group of the cystine and it attaches onto the carbon of this ubiquitous molecule. And so we see that this amp is released in the process. So this is ultimately step number one that we have here. Now, step number two is catalyzed by an enzyme we call the Ubiquitin conjugating enzyme conjugating enzyme or E Two. And what this enzyme ultimately does is it transfers that Ubiquitin from the enzyme E One onto the enzyme E Two.