In studying normal and mutant forms of a particular human enzyme, a geneticist came across a particularly interesting mutant form of the enzyme. the normal enzyme is 227 amino acids long, but the mutant form was 312 amino acids long, having that extra 85 amino acids as a block in the middle of the normal sequence. the inserted amino acids do not correspond in any way to the normal protein sequence. what are possible explanations for this phenomenon? how would distinguish among them?
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