Figure 5: Schematic illustration shows implantation of stem/progenitor cells (s/pC) under the renal capsula fibrosa (CF) after mounting within a polyester fleece (PF). (a) The polyester fibers provide on the one hand mechanical stability during surgical handling. (b) On the other hand, the space between the fleece fibers contains a certain amount of culture medium enabling contained stem/progenitor cells to stand (lighted arrow) influences of harmful interstitial fluid (IF) derived from degenerating tubules (dT). (c) During the initial period of seeding, fresh culture medium can be transported (dark arrow) over a thin tube to the polyester fleece reservoir, while by an efferent tube waste liquid is eliminated.