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Fig. 5. Association of activated STAT1, IFN
and IFNGR1 with nuclear
importer, NPI-1. Cell extracts from WISH cells transduced for 8 hours with an
empty vector (lane 1), NLS-mutated IFN
expression vector (lane 2) or
non-secreted IFN
expression vector (lane 3) were used for
immunoprecipitation with an antibody to NPI-1. Equal amounts of
immunoprecipitates were electrophoresed and probed individually with
antibodies to IFNGR1 (first row), IFN
(second row), phospho-STAT1
(third row) or NPI-1 (fourth row).