(D) Effect of CCB02 in the presence of control siRNA and CPAP siRNA in MCF10A (i) MDA-MB-231 cells (ii) CPAP depletion does not prevent centrosomes from clustering (second rows of i and ii). Note, in CPAP depleted cultures, centrosomes are marked with Cep152 (green) where CPAP (magenta) is detected faintly. In CPAP depleted cells, CCB02 does not prevent extra centrosomes from clustering (fourth rows of i and ii). Note CCB02 does prevent extra centrosomes from clustering in cultures treated with control siRNA (third rows of i and ii). Cells are stained for Cep152 (green), CPAP (magenta), microtubules (α-tubulin, red) and DNA (DAPI, blue). Scale bar, 2µm 