After 6 days of osteoblast differentiation, cells were fixed with acetone/10 mM citrate buffer pH4.2 (1.5:1 ratio) at room temperature for 5 min and incubated for 1 h at room temperature with ALP substrate staining solution containing 0.2 mg/ml Naphtol-AS-TR-phosphate dissolved in distilled water (1:5) and 0.417 mg/ml Fast Red dissolved in 0.1 M Tris buffer.
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