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To test the importance of certain amino acid residues in stabilising a protein structure, a research student performs equilibrium unfolding experiments with three forms of the protein:
(A) the wild type protein;
(B) a mutant in which a slightly stabilising interaction is introduced; and
(C) a mutant in which two slightly stabilising interactions are introduced.
They obtain the three unfolding curves shown below.
Which curves correspond to which forms of the protein?