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(a?d) Four examples of 3-D models of the multi-segment complex are shown. The schemes illustrated in the right column show the order of the eight RNPs, which are numbered from 3 to 8 in descending order of length (that is, 3, 3, 3, 4, 5, 6, 7 and 8). For clarity, the four longer RNPs (that is, numbers 3, 3, 3 and 4) are coloured red and the four shorter RNPs (that is, numbers 5, 6, 7 and 8) are coloured grey.
