Figure 1: Cryo-EM reconstruction of B41 SOSIP.664 in complex with sCD4 and 17b Fab. Figure 2: CD4–17b-bound B41 SOSIP.664 structural rearrangements that result in a stable fusion intermediate. Figure ...

If you received a letter and you're thinking "well, what NOW?" here are the best ways to open that pesky envelope. I realized the other day that I don’t know how to open an envelope. I mean, I can ...