Cilia

http://www.newscientist.com/article/dn12149-cell-hair-loss-may-help-cancers-spread.html

I speculate that cells maintain and maybe help transmit their electromagnetic signatures using these cilia. This EM field is important to cells because it tells them what kind of product to make using the DNA at the center. A cell receiving different em frequency can probably change into different cells, unless its intramagnetic 'cement' has hardened. Different organs produce different EM data. A developing baby has unique EM to its field, which MC Eschers itself in unique and formative ways, which will tell the embryo how to develop.

Interior data: DNA
Exterior data: EM