The method is much less cumbersome than dealing with chicken eggs, and because the vaccine is so easy to produce, the company intends to use 135 micrograms of hemagglutinin in each dose of vaccine — 3 times higher than current flu vaccines — in hopes of getting better protection. (sciencemag.org)
Wilson's laboratory used X-ray crystallography to determine the atomic structures of the H7N9 hemagglutinin protein bound to these sialic acid receptor molecules. (sciencedaily.com)
Of those, five were in the virus's hemagglutinin gene. (sciencenews.org)