Figure 7
A detailed evolutionary scenario for the origin and the evolution of the archaeal flagellum based on figure 6. The purple cluster represents the ancestor of fla 1 and fla 2 clusters. The black circle represents the last common ancestor of Archaea. Blue arrows represent the recent duplication events. Black arrows indicate gene movements to different locations from their original positions in the cluster. Dark green { symbols indicate gene insertions within the clusters. The blue, red and black crosses represent the loss of the fla 1 cluster, fla 2A cluster, or of single genes, respectively. A red arrow indicates gene inversion. F indicates the fusion of FlaC and FlaD. The green arrows represent horizontal gene transfers.