LRR X-BRI1-L group of Pac compared with Arabidopsis RLK/Pelle subfamily LRR X. A: Neighbor-joining tree of the aa sequences of: Pac (pac, ♦) which were obtained with BRI1 (−like) primers; the complete LRR X subfamily of Arabidopsis, which includes the BRI1 group (◊)  and other homologous sequences of rice and poplar. Analysis was based on the kinase domain region spanning subdomain I up to the beginning of X. See caption of Figure 1 for additional details on the representation of the tree. B Identity and similarity values and the number of gaps derived from the pairwise comparison of the Pac sequences with the Arabidopsis members of the BRI1 group.