What exactly are proteins made of?
The ingredients of any protein are amino acids. To build a protein we must build a long chain of amino acids. There are 20 different sorts of amino acids, so there are several different protein chains we can build. Biologists give amino acids some sort of code letter, as for DNA. This is much easier than writing out the main name each time. For instance, M is methionine, L is usually leucine, F is phenylalanine (because P is proline).
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