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(a) Monomers A, B and C (shown in cpk) in the krait trimer forming a highly potent active unit with active sites (red colour) fully exposed. (b) Monomers A, B and C (shown in cpk) in the cobra trimer showing the active sites (red colour) to be fully occluded. The figures were produced with MOLSCRIPT (Kraulis, 1991 ▶) and RASTER3D (Merritt & Murphy, 1994 ▶)
