The linker length is long enough to allow helices to fold in parallel or anti-parallel conformations, but experiments suggest only anti-parallel folding occurs.
2.
A concertina fold, also known as a zig-zag fold, accordion fold or z-fold, is a continuous parallel folding of brochures and similar printed material in an accordion-like fashion, that is with folds alternatively made to the front and back in zig-zag folds.
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