Overo refers to several genetically unrelated pinto coloration patterns of white-over-dark body markings in horses, and is a term used by the American Paint Horse Association to classify a set of pinto patterns that are not Tobiano.
Cerebrospinal fluid signals control the behavior of stem cells in the brain. FULL STORY. When stem cells from the old brain are cultured with signals of a young choroid plexus they can divide and form new neurons (red).
DNA-The Double Helix. Recall that the. nucleus. is a small spherical, dense body in a cell. It is often called the control center because it controls all the activities of the cell including cell reproduction, and heredity.