To return or go back, particularly to return to a pattern of behavior or level of skill characteristic of a younger age. For example, if a 3-year-old child begins to regress by losing the ability to control his bowels or speak, that is a cause for medical concern.
- Regulatory gene
A gene that regulates the expression of other genes.
- Regulatory region
A region of a chromosome that controls gene expression. In terms of DNA, it is a regulatory sequence.
- Regulatory sequence
A sequence of bases in DNA that controls gene expression.
- Regulatory T cell
A T cell (T lymphocyte) that regulates the activity of another T cell, usually by suppressing its activity. This process can be beneficial or harmful. There are several different types of regulatory T cells.
A backward flowing. For example, vomiting is a regurgitation of food from the stomach, and the sloshing of blood back into the heart when a heart valve is incompetent is a regurgitation of blood.