Figure 2. Phalloidin labeling of filamentous actin (F-actin) in C57BL/6 mouse aqueous drainage tract. A: positive F-actin labeling (red) was seen in the ciliary muscle (opened arrows) adjacent to the pigmented ciliary body (CB) and trabecular meshwork (TM; closed arrows). F-actin labeling was positive in the TM extending from the iridocorneal angle (arrowhead) and alongside SC (asterisk *). B and C: Merged bright field-fluorescence images provide detailed structural orientation. Scale bars, 20 μm.