Western blot analysis of extracts of HeLa cells, using Anti-Smad1 (phospho Ser463 + Ser465) + SMAD5 (phospho Ser463 + Ser465) + SMAD9 (phospho Ser465 + Ser467) Antibody (A90723) at 1:1,000 dilution. HeLa cells were treated by ATP(5 mM) at 30°C for 1 hour. The secondary antibody was Goat Anti-Rabbit IgG H&L Antibody (HRP) at 1:10,000 dilution. Lysates/proteins were present at 25µg per lane. The blocking buffer used was 3% BSA. Detection was with a ECL Basic Kit. Exposure time: 60s.