Detection of a T.C mismatch in a 547 bp DNA fragment by using KMnO4 / piperidine assay. The control trace (homoduplex, top) shows no cleavage peak and the mismatched DNA trace (heteroduplex, bottom) displays a strong cleavage peak of the mismatched T base in the 3'HEX sequence. Note consistent background in both traces which is essentially a chemical sequencing trace of T bases allowing confidence that reaction has occurred and a position reference.
Bui et al. BMC Chemical Biology 2003 3:1 doi:10.1186/1472-6769-3-1