But, returning to comparison of genetic information to History, DNA and History have the repeating pattern – DNA uses the four repeating nucleotides as the pattern, while History uses the repeating events as the basis on which it is built. This pattern could also be applied to the other two common cellular constituents – RNA (four nucleotides), and proteins (made from a combination of 20 different amino acids). Both deoxyribonucleic acid and History put the repeating patterns into different sequences to get different outcomes – AGCCTATCTG vs. ATTAGCCTTA . But DNA is not just made of patterns – there are also changes, or mutations.