Fig. 4From: Ultrastructural changes during osteogenic differentiation in mesenchymal stromal cells cultured in alginate hydrogelThe micrographs showing the surface differences between BMSC cultured in hydrogel from osteogenic conditions (a, c, arrows—vesicular structures) and from non-osteogenic control (b, d, arrowheads—nano-sized fibers); scale bars 5 µm (a, b), 1 µm (c, d)Back to article page