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).
Most cells have: 1  A nucleus â controlling the activity of the cell. 2  Cytoplasm â where chemical reactions occur. 3  A cell membrane â to control the passage of substances in and out of the cell. 4  A Mitochondria which is where the energy is released from.ost cells have: 1  A nucleus â controlling the activity of the cell. 2  Cytoplasm â where chemical reactions occur. 3  A cell membrane â to control the passage of substances in and out of the cell. 4  A Mitochondria which is where the energy is released from.