Production of pol-prim complexes containing a chimeric p48 subunit. One microgram of each purified pol-prim complex (pol-prim with murine p180, p68, p58, and chimeric p48 [lanes 1 to 4], murine pol-prim [lane 5], pol-prim with human p180, p68, p58, and chimeric p48 [lanes 6 to 10], and human pol-prim [lane 11]) was analyzed by SDS gel electrophoresis and stained with silver.