Figure 2

Dendrogram of the 19 human aldehyde dehydrogenase ( ALDH ) genes that are bona fide members of the ALDH superfamily. To avoid additional clutter, alternative splice variants of ALDH genes have not been included in the construction of this tree or the three pseudogenes listed in Table 1. This neighbour-joining method gives various branches of different lengths, reflecting that evolutionary divergence is not the same between different branches of the gene tree.