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The amplified fragment forms the H16, H17 and H18 helices that, together with H3 and H4, form the 5-way junction (5 WJ), shown in a yellow circle. The 5′end forms part of H4 and the whole of H16, whereas the 3′ end is part of H18. The middle and hypervariable part forms H7, which has a basic section (in blue) and a growth part (orange) that does not seem to affect the functional structure of 5 WJ and is where modifying-size insertions are accepted.
