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a, The fusion loop that connects β19 and β20 of GP2 projects onto a shallow depression on the surface of a neighbouring monomer. The fusion loop is shown as a red coil with side-chains drawn as grey sticks, the neighbouring monomer is shown in semi-transparent surface representation. b, Comparison of the fusion loop in the apo GP (red and grey) obtained at pH 5.2 with that in the KZ52 Fab complex (cyan) obtained at pH 8.3.
