The image shows the density of actin filaments (in the presence of 1µM of actin monomers) at the centrosome color-coded with the FIRE look-up table and the definition of central, peripheral and distal regions corresponding to decreasing concentrations of actin filaments. Scale bar: 20 μm. The graph shows the measurements of microtubule growth rate in each region. Data were pooled from 3 independent experiments: central zone: n=58, peripheral: n=104, outside: n=61; n. s. means no statistical difference between the data set according to Mann-Whitney test. 