For HIV, the viral envelope promotes fusion of the viral membrane ... Figure 1: Models of flap-dependent HIV nuclear import. It is the association of virion proteins with viral nucleic acids ...

You write the letter, fold it, lick some gummed flaps, and suddenly your letter has turned itself into an envelope. The trouble is, our friends keep having afterthoughts, and they write all over ...

Step 2Fold in both sides of the paper. This will create the flaps of the envelope. They will both overlap the card. You can use your hands to make the folds, or your bone folder if you have one.