Mirror neurons: a definition. Description: Professor Christian Keysers explains that mirror neurons in the premotor cortex respond when we perform an action and also when we see someone else perform that action. This is similar to empathy. Transcript: Mirror neurons are a set of neurons that we discovered in the premotor cortex of the monkey.
lectin. [ 1 lekâ²tin] 2  a protein in seeds and other parts of certain plants that binds with glycoproteins and glycolipids on the surface of animal cells, causing agglutination. Some lectins agglutinate erythrocytes in specific blood groups, and others stimulate the production of T lymphocytes.
It is your body's natural weight control mechanism. And the great thing about leptin is that it is produced naturally in the body. 1  It lets your brain know how much fat is in your body. 2  As leptin levels rise, your appetite diminishes. 3  As leptin levels fall, your appetite increases. 4  It regulates the rate of fat breakdown.