Fig. 1From: Two-photon FLIM of NAD(P)H and FAD in mesenchymal stem cells undergoing either osteogenic or chondrogenic differentiationMicroscopic images of undifferentiated and differentiated MSCs in transmitted light. a Undifferentiated MSCs, incubated in standard growth medium b MSCs on day 21 of osteogenic differentiation (Alizarin Red S staining) c MSCs on day 21 of chondrogenic differentiation (Alcian blue staining). The image size is 1289 × 964 μm (1392 × 1041 pixels)Back to article page