conformation dipoles as seeds of order. Also unlike the lattices that consist of
even number of protofilaments (12 or 14) in the 13B lattice to the antiferroelectric
ground state can correspond two different values of polarization: - 1/13 when all
dipoles in 6 rows point up and all dipoles in 7 rows point down and + 1/13 when all
dipoles in 7 rows point up and all dipoles in 6 rows point down. The
computational simulations (Trpisova & Brown, 1998) reveal that the + ‰ or - ‰
polarization depends on the MAP/microtubule ratio.

Ξeaιτ∣
Fig. 17 Unfolded and wrapped 13A and 13B microtubule lattices. Modified from
Tuszynski et al (1998). Brain microtubules in vivo possess 13B lattice Song &
Mandeikow1 1993' Kkkawa et al, 199 ).
59
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