Research Article

High-Titre Neutralizing Antibodies to H1N1 Influenza Virus after Mouse Immunization with Yeast Expressed H1 Antigen: A Promising Influenza Vaccine Candidate

Figure 4

Transmission electron microscopy of the purified H1 antigen. Image was obtained at nominal 30000 magnification. The black scale bar represents 50 nm. Rosette-like structures were visualized.