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Packing in the two model systems: in 2Y3J (left), the beta sheets are arranged in a parallel fashion around the fibril axes whereas in 2Y2A (right) they are arranged in an anti-parallel fashion. The number of chains per unit cell is 8 and 4 respectively, in both cases two unit cells are shown. Unit cell axes are shown and colored in red, green, blue for a, b, c respectively.
