Streptavidin identified in the vaccine protein profiles. Streptavidin identified in the vaccine protein profiles. A, Western blot analysis of vaccine probed with vaccinated rat serum. B, Western blot analysis of vaccine probed with anti-streptavidin. C, silver-stained PAGE separation of a representative rat vaccine using streptavidin selection. Std, protein standards (Precision Plus; Bio-Rad Laboratories Pty Ltd.). Chris Weir et al. Cancer Immunol Res 2014;2:469-479 ©2014 by American Association for Cancer Research