Expression of transcription factors in osteoclast differentiation.
Infected cells were treated with RANKL (50 ng/ml) for 3 days, and nuclear
extracts were analyzed by immunoblotting with antibodies against PU.1
(A), MITF (B), c-Fos (C), and NFATc1 (D).
Quantitative image analysis of the protein expression levels (values below
bands) was normalized to histone H3. IB, immunoblotting.