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Structures of G proteins

Description
a. A heterotrimeric complex, with the subunit derived from a Gi protein.

b. Superposition of an a protein from Gi and a Gsa protein–GTPgS complex.

A complex between Gsa-GTPgS  (to the left) and the catalytic core of adenylate cyclase (to the right).

The upper side is believed to face the plasma membrane.
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