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There are twenty amino acids in proteins, three bases in a codon and three bases in an anti-codon newly known as an anti-sense codon.

If the codons make up mRNA , then the anti-sense codons are found in the transfer RNAs. A triplet codon corresponds to an amino acid. Adenine pairs with Uracil, and Guanine Pairs with Cytosine.

Let's say we had a mRNA strand like: AUACGUACGUACGUCACGUGAUGCUACACCUGACAUCCGAUCAUGAGUCGAUCAUGAUGA (oops, there's no more)

The first codon is AUA. The anti-codon UAU, would attach to it. AUA corresponds to the amino acid Tyrosine. Then the next anti-codon GCA would attach to the second codon CGU. Arginine corresponds to the codon CGU. Tyrosine would join together with Arginine. The bond of the Tyrosine and its tRNA breaks. This is all done by a ribosome. The process continues until the chain is complete.

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