And that is enough to basically describe the 20 different amino acids that exist in nature. Now, right away, you should notice that the genetic code contains 64 different codons in that particular genetic code. So 64 different variations of three letter sequences of nucleotides. And since there are only 20 different amino acids that exist in nature, that implies that many of the three letter codons correspond to the same exact amino acid. And this phenomenon, the fact that two or more different codons can correspond to the same exact amino acid, makes our genetic code redundant or degenerate. So, basically, if we look at the following diagram, it describes what we just mentioned.