the responses of mouse embryo brain ( meb ) cell cultures and of madin-darby canine kidney cells and chicken embryo fibroblasts to infection with a/pr/8/34 ( pr8 ) , a/ws/33 ( ws ) , or the neurovirulent wsn variant were compared in terms of ( i ) single-cycle yields of hemagglutinating and associated neuraminidase ( na ) activities and plaque-forming particles , the latter with or without trypsin activation [ pfu ( tr++ ) or pfu ( tr -- ) , respectively ] , and ( ii ) expression of nucleoprotein ( np ) , m1 , and ns1 protein , determined for specific cell types by immunostaining , for whole culture lysates by western blot analysis of np and m1 .
C0033684
protein
C0028612
np