Figure 4. Regulation of the cytoskeleton is key to secretion both in early embryos and in larvae.

(A) Regulatory hierarchies controlling the actinomyosin network are required in embryos to target vesicles for apical secretion (left) and in larvae for efficient secretion of salivary glue proteins (right). (B) Sequence of cellular and molecular events governing efficient exocytosis of secretory vesicle content in late larval SGs.