Different conductance levels correspond to different numbers of helices in the bundle.
The number of helices is expressed as a fraction of the total number of helices to make the bars comparable between different organisms.
The existence of a pseudo-fivefold symmetry within the resulting bundle of 20 transmembrane helices also helped interpretation in terms of the amino-acid sequence.
Effect of a triplex-binding ligand on parallel and antiparallel triple helices using short unmodified and arcidine-linked oligonucleotides.
These double helices are separated by single-strand sequences of zero or more residues.
These arms are pushed into this position by a ' pedestal ' of three a helices.
The positioning of the different helices on the page is adjusted for artistic convenience, and is arranged so that the chain does not cross itself.
Individual side-chains from these helices participate either in core packing within individual domains, or in contacts across the interdomain interface.
