TNF and Oligodontia: Three EDA mutations c.865C>T, p.Arg289Cys (Song et al., 2009); c.866G>A, p.Arg289His (Ruiz–Heiland et al., 2016); and c.1013C>T, p.Thr338Met (Han et al., 2008) (Figure 3) were found in oligodontia patients 1, 2, 3, respectively, all of which are located in the TNF domain.