  We investigate possible shapes of the electric field, which oscillating
dipoles in a certain region of biological tissue can produce in a neighboring
region, or outside the tissue boundaries. We find that a wide range of shapes,
including the typical morphology of limbs and appendages, can be generated as a
zone of extremely low field amplitudes embedded in a zone of much larger field
amplitudes. Neutral molecules with a resonance close to the frequency of the
oscillating field may be attracted to this zone or be repelled from it, while
the driving effect on molecules with an electric charge is only extremely weak.
The forces would be sufficient for the controlled deposition of molecules
during growth or regeneration. They could also serve as a method of information
transfer.
