Para-sagittal histological images of hematoxylin and eosin (H&E) (left column) and Masson's trichrome (middle column) with corresponding micro-computed tomography (μCT) images (right column) between the L4 and L5 transverse processes (TPs). Representative histological and μCT images show no bone formation from a Sham animal (A, D, G), bony fusion from an Isograft animal (B, E, H: thick arrow), and fibrous union from Isograft#03 (C, F, I: thin arrow). Histological slides were scanned with a Leica SCN400 Slide Scanner (40×), and μCT images were obtained using the SkyScan 1076 (18 μm). Scale bar=1 mm. Color images available online at www.liebertpub.com/tec