Figure 4: TEM images of a hyaline-like RT area treated with a chondrocytes seeded collagen type I/III fleece showing a differentiated chondrocyte containing glycogen (g, black area) and lipid (li, bright droplets) in the cytoplasm and large, compact fibre strands (arrows) embedded in the dense matrix surrounding the cell (A, B). In high magnification the fibre strands resemble the structure of the scaffold material (collagen type I/III fleece). C: Image of the pure scaffold material collagen type I/III fleece directly taken from cell culture shows large, dark fibres (l) and smaller, brighter ones (s). Scale bars: (A) 5 µm, (B and C) 2 µm.