Description:exc-4(rh133) (1/76) unc-54, exc-5(n2672) (1/32) unc-31, exc-6(rh103). (3/40) dpy-1, . Usually noncystic but slightly shortened canal. exc-4. I rh133, n561, n2400. Severe, regional enlargement with frequent septations. Larval sublethal. exc-5. IV rh232, rh275 visible using only a dissection microsc