We have deoxy adenylate, we have deoxy, guanolate, and so forth. So four of these different types of nucleotides. And notice that because we have the deoxy, that simply means we don't have that oxygen found on the second carbon. And so if we want to describe the four different types of nucleotides on RNA molecules, we simply remove our deoxy term from this term, this term and this term. Now, because we don't have a thymine in RNA, this will be different in RNA. Now, the last thing I'd like to talk about is how we actually write down our sequence of nucleotides in a DNA molecule.