Fig 3. Representative photomicrographs obtained under polarizing microscopy demonstrate the distribution of collagen fibers in the scar tissue of rats treated with Strychnos pseudoquina ointment.

Collagen fibers (type I) appear in shades of bright colors ranging from red to yellow, while thin reticular fibers (collagen type III) appear bright green. Tissue fragments were collected every 7 days during 21 days of treatment. Day 0 refers to the normal untreated tissue. Bar = 40 μm. Sirius red.