How Can Cells Recognize One Another?
In high school or at college, we've studied how human beings are formed. In its first stages, the embryo is a formless piece of tissue. But as it continues to develop, some cells form the arms, some the inner organs, and a few are set aside for the eyes. Every cell "knows" where it must go, which organ it will form, to what degree it should multiply, and when to stop dividing. But the following extract provides another amazing fact about the embryo's development:
we separate the cells of the embryo that belong to different organs—by decreasing the amount of calcium in the environment—and then later on, mix these cells together in a suitable environment, we find that on coming into contact once again, the cells that belong to the same organs recognize each other and form distinct groups of cells that belong to the same organs. (Ahmet Noyan, Yasamda ve Hekimlikte Fizyoloji (Physiology in Life and Medicine), 10th ed., Ankara:Meteksan Publications, 1998, p. 40)
That is, if cells are first separated from each other, then brought together again, the cells that make up the same organs recognize each other and reassemble themselves again.
But how can these cells, which have no brain or nervous system, no eyes or no ears, recognize each other? How do these substances, formed from some molecules with no brain or consciousness, recognize their own type of cell out of a group? How can they know that they will later unite to form an organ? What is the source of the obvious consciousness displayed by these unconscious molecules?
The source of their consciousness is God, the Lord of the worlds, Who created the whole universe out of nothing.
We will show them Our signs on the horizon and within themselves until it is clear to them that it is the truth. Is it not enough for your Lord that He is a witness of everything? (Qur'an, 41: 53)
1. spleen cell, 2. cartilage cell, 3. blood cell, 4. areola cell, 5. muscle cell, 6. fat cell, 7. bone cell
When the cells of different organs of an embryo are mixed up together in a suitable environment, cells belonging to the same organs organize themselves into distinct groups.