UCN2 and short rib dysplasia: Moreover, Trichrome stain histopathological features of rat periodontal tissue in SRP group after four weeks of treatment showed a moderate amount of collagen fibers grouped in poorly cohesive beams (score 1) (Figure 5A), whereas the dominant presence of well-oriented mature collagen fibers grouped in bundles with a prominent remodeling effect (score 2) was seen in both SRP+T and SRP+CU groups (Figure 5B,C).