Fig. 2.

Signaling pathways activated by engagement of Kirre and Sns during myoblast fusion in Drosophila. Most factors shown have been assessed for a role in vertebrate myoblast fusion also, as described in the text. Factors touching each other or that are connected by a solid arrow have been shown to bind directly to one another. Dashed arrows indicate that the interactions have not been shown to be direct or relate to complex processes, as described in the legend to Fig. 1.