FIG. 4.

Representative histology images of Bone Marrow constructs, Cord Blood constructs, and equine patellar cartilage (Control). For each section a low magnification image is presented on the left with higher magnification images corresponding to the black boxed regions on the right. Scale bars are presented in the top image of each column and reflect the scale for all images in the column: 200 μm for low magnification images, 50 μm for high magnification and Control images. H&E staining highlights the lacuna structures and hematoxylin intense staining representative of articular cartilage in both the native tissue Control and Cord Blood groups; however, these characteristics are largely absent in the Bone Marrow group. Picrosirius red (PicR) highlights the collagen content, which had higher stain uptake in Bone Marrow compared to Cord Blood, whereas Safranin-O (SafO) with a Fast-Green counterstain highlights GAG content, which had higher stain uptake in Cord Blood. H&E, hematoxylin and eosin.