Figure 6: Scanning electron microscopy of tubules growing on polyester fleece I-7 (a, d, g), Posi-4 (b, e, h) and Posi-5 (c, f, i). In all of the cases it is observed that the tubules (T) are in more (black dot) or less (white dot) neighborhood to polyester fibers (PF). The surface of tubules is covered by a basal lamina. Occasionally interstitial cells (IC) can be recognized.