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Figure 3.
Figure 3. Representative electron-density for cholera toxin. Stereo view of the 2Fo--Fc electron-density map at the junction
between the A subunit and the B pentamer. The long A2 a-helix (orange) can be seen as it begins its descent into the
central pore. Residues belonging to the A1 chain or to the B pentamer are indicated (Pro120 and Ala(4)75, respectively).
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