Fig. 7

Bayesian tree for C-terminal spidroin-encoding nucleotide sequences. See Table 1 for accessions. Bold branches are supported by > 50% bootstrap parsimony and > 95% posterior probability in all analyses of C-terminal sequences (see Additional file 1: Figure S8). Asterisks (*) indicate > 95% posterior probability in Bayesian analyses of C-terminal sequences. Units are substitutions per site. The tree is rooted with Bc fibroin1. Duplications inferred by reconciliation with the species trees in Fig. 1 are shown as red dots at nodes. The red dots with yellow outlines indicate that concerted evolution of terminal encoding regions could also explain the observed relationships