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Photomicrograph of the histochemical staining for alkaline phosphatase (ALP) and alizarin red in chondrocytes in an in vitro model of human femoral head necrosis (FHN). Alkaline phosphatase (ALP) staining and alizarin red staining of chondrocytes from control, alcohol-induced, and steroid-induced femoral head necrosis (FHN). Positive ALP (indigo) and alizarin red staining (orange). Scale bar: 200 μm.
