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A third protein associates with Bright. Extracts from CHO cells transfected with myc-tagged Bright and/or Btk were immunoprecipitated with anti-myc antibody (lanes 2 to 5) or the isotype control, anti-Sp1 (lane 1), and immunoblotted (IB) with anti-Bright, antiphosphotyrosine (A), or anti-BAP135/TFII-I (B) antibodies. Positions of molecular weight markers are indicated. Data are representative of two separate experiments.
