Fig. 7. Phenotypes associated with sax null clones. (A) A large sax null clone occupying most of the posterior compartment. Unlike gbb clones, this clone is not associated with loss of L4, L5 or the PCV. (B) In this wing, two independent clones encompass most of the posterior compartment and half of the anterior compartment. Note that the clone boundary running along the middle of the anterior compartment is associated with an ectopic vein. (C) A large sax null clone occupying the entire anterior compartment. Like the posterior clone in A there is no effect on venation; however, the wing is reduced in size as has been shown previously (Singer et al., 1997).