Time-dependent induction of VAP-1 in parenchymal organs during fetal development in man. Representative immunohistochemical stainings of VAP-1 in liver (black arrow indicates central vein; white arrow, sinusoid), heart (black arrow, capillary), kidney (black arrow, intertubular capillaries; G indicates glomerulus) and gut (black arrow, gut wall; white arrow, muscularis mucosae; arrowhead, epithelium) at the indicated weeks of gestation are shown. Negative control (Neg.Co) stainings from the same specimens are also shown (lower row for each organ). Scale bar indicates 50 μm. Objective magnification for all images, 20×.