In March, we would like to present a photography taken by Olena Yakushko, a doctoral student from the Department of Histology and Embryology, Faculty of Medicine in Pilsen. In this photography we see a cross-sectional area of the callus after surgical fixation of broken porcine ribs, immune-stained using von Willebrand factor antibodies. The picture was obtained by mounting cross-sectional pictures taken by Nikon Eclipse Ti-U microscope equipped with standard optical lenses, a high-resolution digital imaging camera (Promicra 3-3CC) and a ProScan III motorized 3-axis step motor (Prior Electronics, UK).