stimulation of randomly locomoting cells with a chemoattractant ( chemokinesis ) rapidly ( within 1 min ) induces pronounced spreading and ruffling and concomitantly initiates , in up to 55 % of the cells , transient separation of the centrosome into two solitary centrioles , each surrounded by an aster of microtubules .
C0007634
cells
C0007708
centrioles