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Loop arrangements in the tetramer. The six special loops engaged in monomer–monomer interactions are shown in the color coding introduced in Fig. 3. (a) The D–A dimer as seen from outside of the tetramer along the local 2-fold axis. (b) The monomer viewed in standard orientation. (c) Front view of the tetramer. (d) The A–B dimer seen from outside of the tetramer along the local 2-fold axis.
