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.
Leptin is a cell-signalling hormone vital in the regulation of appetite, food intake and body weight. Studies have shown that an absence of leptin in the body or leptin resistance can lead to uncontrolled feeding and weight gain. Mechanisms and actions of leptin. Leptin acts as a hormone that modulates the size of the adipose tissues in the body. It regulates food intake and body weight.