Fig 3. Photomicrographs of collagen formation. A, From the PA group, there is scant collagen within the aneurysm dome at 1 month (Masson trichrome, original magnification 100x). B, from the FBC group, there is local collagen deposition at 3 months (Masson trichrome, original magnification 100x). C–D, Both from the Ad-BMP-13 group, C shows diffuse, collagenous fibers within the dome at 1 month (Masson trichrome, original magnification 100x), and D shows a denser, more mature collagen within the dome at 6 months (Masson trichrome, original magnification 150x)..