Figure 9. Schematic representation of the structural changes in the hemagglutinin trimer following acidification.

Figure 9

Schematic representation of the structural changes in the hemagglutinin trimer following acidification. (A) Neutral pH (virion-associated) form. (B) Acid pH (endosome-activated) form.

From: Retroviral Env Gene Products: Receptor Binding and Host-Range Determinants

Cover of Retroviruses
Retroviruses.
Coffin JM, Hughes SH, Varmus HE, editors.
Cold Spring Harbor (NY): Cold Spring Harbor Laboratory Press; 1997.
Copyright © 1997, Cold Spring Harbor Laboratory Press.

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