%0 Journal Article %T ¡°Breathing¡± Hemagglutinin Reveals Cryptic Epitopes for Universal Influenza Vaccine Design %J - %D 2019 %R https://doi.org/10.1016/j.cell.2019.04.034 %X A universal vaccine against influenza remains a critical target, and efforts have recently focused on the stem of the hemagglutinin glycoprotein. In this issue of Cell and a related Cell Host & Microbe article, three studies identify broad protective epitopes in the hemagglutinin head domain that are exposed by trimer ¡°breathing. %U https://www.cell.com/cell/fulltext/S0092-8674(19)30453-2