Homoduplices

Melting differences of heteroduplices compared to homoduplices are probably influenced by both the mutation and the surrounding sequence, e.g. for the 3905insT-mutation where one additional T is inserted into a stretch of 6 Ts.

Source: wiktionary

Because more homoduplices than heteroduplices develop after rehybridization, a rather intense background pattern is obtained from the digested homoduplices, which can cause the interesting bands to disappear.

Source: wiktionary

The DGGE technique allows for verification of heteroplasmy through the resolution of mismatch-containing heteroduplices from fully base-paired homoduplices in an increasingly denaturing environment.

Source: wiktionary