Magnetic flux tubes containing dark particles (ordinary particles with large value of Planck constant) have gradually involved to a basic structure of TGD based quantum model of living matter. For instance, in the model of DNA as topological quantum computer they define braidings coding for topological quantum computation programs. The matter inside cell would form a complex web in which various biomolecules are connected by the flux tubes. The basic functions of cell would rely on two mechanisms: the contraction and expansion of the flux tubes induced by a phase transition changing the value of Planck constant and the reconnection of magnetic flux tubes changing the topology of this web.
Could these flux tubes serve as templates for the formation of nanotubes? The natural idea is that they do so for various linear structures filling the living cell and for axons, DNA and aminoacid sequences, axons, and other linear structures populating living matter. The interested reader might find the articles at my homepage interesting.