Now, Nmpkinases catalyze the transfer of a phosphoryl group from some type type of nucleotide triphosphate, for example, ATP molecule onto another molecule, namely the nucleoside monophosphate or NMP. And to basically show what that means, let's take a look at the following general chemical equation. So we have two reactants, two substrate molecules and this reaction is catalyzed by some type of NMP kinase. Now in this particular case, because I'm using ATP as a specific nucleuside triphosphate, the name of the NMP kinase molecule is adenylate kinase. And so adenylate kinase will catalyze the transfer of this purple terminal phosphoryl group from the ATP molecule onto this region of the nucleocide monophosphate and we ultimately form the nucleocide diphosphate and the adenosine diphosphate. So this loses a phosphoryl group and this gains a phosphoryl group.