Detection of NDV viral proteins in the mock- and NDV-infected MCF7 and MCF7-CR cells. (A) Polyclonal antibodies against NDV were used to probe for viral proteins in the total cell lysates harvested following different hours post-infection. A monoclonal antibody against the NP protein of NDV was also used. (B) The intensity of the NP protein bands were quantitated and plotted in a graphical format. Values are presented as means ± SD of triplicate blots.