The in vitro infection of sheep choroid plexus cells by Visna virus induces changes in the distribution and the orientation of actin containing filament bundles. During the cell fusion the stellate shape of cells with several interdigitations is associated with radial spanning of the contractile system. The intercellular contacts are characterized by the occurrence of a discontinuous line of rich actin containing dots which could be a junction of several short filament bundles.
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