Movie 1

Serial block-face scanning electron microscopy shows a blood vessel coated with collagen I and associated with osteoblast. 3D reconstruction using 321 images generated by SBF-SEM analysis of humerus from an E16.5 mouse embryo. A blood vessel consisting of three ECs and carrying a red blood cell (different shades of red) is covered with collagen (green) and associated with osteoblast (blue).