  The important role of centre vortices in dynamical chiral symmetry breaking
and corresponding dynamical mass generation has been demonstrated in pure gauge
studies of the Landau-gauge quark propagator. We present initial results of our
investigation into the impact of centre vortex removal on the Landau-gauge
propagator on dynamical gauge fields. To ensure sensitivity to the topology of
the gauge fields, the propagator is computed with overlap fermions. Upon
removal of centre vortices we find that dynamical mass generation is
suppressed. The quark renormalisation function remains remarkably flat except
in the deep infrared where it exhibits significant suppression. These effects
become more prominent at lighter quark masses.
