Uracil, corresponds to a specific amino acid known as valine. So to see what we mean, let's take a look at the following diagram. So, let's suppose our ribosomes in the cell take the following mRNA. And what the ribosomes do is they use our genetic code to basically translate what these codons correspond to. So the codon guu, the sequence of Guamine uracil uracil, always corresponds to the amino acid valine, while the sequence CCU always corresponds to our amino acid proline. So we see that our genetic code links our mRNA molecule to our protein, and that's exactly how we synthesize or translate our proteins.