Figure 3.

Morphogenesis in sec-23(ij13) embryos. (A–D) Elongation of a wild-type embryo: comma stage (A), two-fold stage (B), three fold stage (C), and pretzel stage (D) after secretion of the cuticle. (E–I) Elongation and collapse of a sec-23(ij13) embryo. (E–H) Images taken at 30-min intervals. (I) Image taken 90 min after H. White arrows, anterior and posterior ends of the pharynx (anterior to the left); black arrows, the width of the pharynx at various points. (J–L) Images taken at 150-min intervals of a homozygotic sec-23(ij13) mutant embryo derived from a chromosomally sec-23(ij13) homozygous mutant mother, transgenic for sec-23. In J, the animal has just initiated hypodermal morphogenesis.