Larger twin primes might be important for the functioning of brain. In the visual cortex the ocular dominance columns associated with the left and right eye form a binary structure of this size. This corresponds to a cell layer with thickness of 128 cells. My meager knowledge about brain physiology does not allow any obvious identification. Meridians seem to correspond to the separatrices separating regions with opposite directions of the electric current flow.
Meridians are also loci of strip like magnetic fluxes ortogonal to the skin.
The stimulation of the organizing centers can induce large changes in the morphogenesis. In partular, the effect of an external electric field on the organizing centers depends on its polarity. There is a voltage difference between the epithelial sheets associated with the organizing centers and the enhancement of electrical conductivity. Organizing centers seem to communicate somehow via meridians. All this suggests that the entire structure could be a scaled up version of a nervous system.