This chapter does not belong to the area of image processing. The reason for including it in this book is the broad and versatile interest circle of the author. The topic of this chapter is related to biology.
One can ask how is it possible that cells of different types are developed during the growth of an organism in spite of the fact that they all have exactly the same deoxyribonucleic acid (DNA) . It can be supposed that each cell must obtain some information indicating its position in the growing organism, perhaps some kind of coordinates. ...
