Relative localization of adipocytes and mineralized matrix. BMSCs were cultured for 14 days in co-differentiation (A), osteogenic (B) or adipogenic (C) medium and treated with 30 μM of calcein blue. Cells were observed under white light (left) and under UV light (right). In left and right panels of (A), the position of some adipocytes was indicated by the arrow heads. Fluorescence refers to mineralized matrix.