Click on image to view larger version.

Fig. 1. Phenotypes of egl-18 chromosomal mutants. (A) Surface view of a
wild-type L1 larva. Alae are clearly visible as two unbroken lines along the
length of the body. (B) Surface view of an egl-18(n475) L1 larva,
showing breaks in alae (arrows) and a twisted body (the basis for the Rol
phenotype). (C) Wild-type vulval opening at the `Christmas tree' (L4) stage
larva. (D) Defective vulval opening of an egl-18(n475) larva at the
L4 stage. (E,F) Adult hermaphrodites, showing the wild-type vulva (E) and the
protruding vulva (Pv1) phenotype (F). In these and subsequent photos, anterior
is towards the left and dorsal is towards the top.