FIG. 1.

Morphology and anatomy of the early developmental changes in the E. scolopes light organ. (A) Scanning electron micrographs of a hatchling (left half) and 96-h old symbiotic (right half) juvenile light organ. Bar = 100 μm. (B) Diagram depicting the juvenile light organ showing the interior crypts of a hatchling light organ (left half) and the changes that occur after colonization with symbiotic bacteria (right half), specifically, the increase in the size of the crypt epithelial cells and the density of microvilli.