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Hexahelical complexes obtained with different modes of helix packing for carp parvalbumin. (a) Sequential amino to carboxyl packing (A + B + C + D + E + F). (b) Sequential carboxyl to amino packing (F + E + D + C + B + A). (c) Around the core pair of helices C and D most shielded in the macromolecule [(C + D) + E + F + B + A]. (d) Same as c but adding the AB complex as a unity [(C + D) + E + F + AB]. Only model a is consistent with the x-ray data.
