Composite gel images of the 2D-PAGE protein pattern profiles of SK-N-MC cells before and after NiV infection. Mock-infected and NiV-infected SK-N-MC cell proteins on 18 cm IPG strips of pH 4–7 (a) and pH 6–11 (b) were analyzed using The Discovery Series PDQUEST 2-D analysis software version 7.2.0 (Bio-Rad Laboratories, USA). Protein spots unique to NiV-infected cells are circled in blue and protein spots absent in the NiV-infected cells are in red. The differentially expressed proteins are circled in green and yellow, indicating spots that are either over abundant (up-regulated) or under represented (down-regulated), respectively. The protein spots were labeled with their unique identification numbers.