Figure 3.

Confocal image of a portion of a macrochaete from a 44-h pupa exhibiting curvature stained with fluorescent phalloidin. The arrows and arrowheads indicate positions of spaces between modules on the superior and inferior surfaces, respectively. What is apparent is that the modules making up the actin cables on the superior surface of the bristle are longer on average than those along the inferior surface of the bristle. Insert, confocal image near the elongating tip of a macrochaete from a 34-h pupa stained with fluorescent phalloidin. Notice that the length of the modules along the superior and inferior surfaces is approximately the same. These modules are all <0.5 μm in length and tend to be in transverse register. Bars, 5 μm.