Figure 8. The effect of Y-27632 on the prevalence of fibripositors. A: Bundles of aligned and uniformly spaced collagen fibrils (arrows) were more prevalent in keratocytes in Y-27632 treated corneas. These resembled fibripositor-like structures, which have been proposed in tendon as a mechanism of uniaxial matrix deposition. These tend to be features of developing, rather than mature, connective tissue matrices. B: Importantly, keratocytes seem to show multiple fibripositor directions. (Arrows; blue=longitudinal, red=transverse, green=oblique) Scale bar: A; 0.5 μm, B; 1 μm.