Figure 5. Light microscope and TEM imaging of dl and wt cuticles.

a,b. Light micrograph of the dorsal cuticle of a fifth instar wt (a) and dl (b) larvae showing darkly pigmented bristles and star-like structures with concentrated pigmentation. c,d. TEM micrograph of dorsal cuticle of fifth instar wt (c) and dl (d) showing a star-like structure containing a homogeneous layer of diffuse pigment that is darker in dl (d).