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Bone cell differentiation in the petri dish. The red dye Alizarin Red S dyes calcium inside the cells, thus proving that they have developed into bone cells.

Longitudinal cut of a bone, next to it a cell culture dish with red liquid in it, a blister of pills, a pipette and pipette tips
Bone cell differentiation in the petri dish. The red dye Alizarin Red S dyes calcium inside the cells, thus proving that they have developed into bone cells. © Dorothee Hieschler, HBRS, im Auftrag für Edda Tobiasch