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 167 amino acid protein encoded by the ob gene. It has been found that leptin is produced for the most part in white adipose tissue, with very small amounts being found in brown adipose tissue.Leptin is a four-helix bundle with one very short strand segment and two relatively long interconnected loops.egulator of metabolism. Small amounts of leptin are also secreted by cells in the epithelium, stomach and placenta. Leptin is a protein hormone with important effects in regulating body weight, metabolism and reproductive function.