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Seen on the other place.
I have been mystified why K represented Lysine for many years. Undergrad #biochemistry lecturer said “I don't know why, but I assume it is because of the end of the side chain looks like a K”. Well, turns out the answer is more simple.
Source: M Eugenio Vazquez. Posted in honour of Margaret Dayhoff, inventor of the single-letter amino acid code
