<prompt> Which of the following is not a calcium binding protein?CalbindinCalmodulinTroponinClathrin  <response>: Clathrin does not bind ca2 On inside of cell membrane beneath coated pits, latticework of fibrillar protein is present called clathrin Helps in pinocytosis Calbindin Present in brush border of intestinal epithelial cells transpo Ca2 into cell cytoplasm Amount of calcium absorption is directly propoional to quantity of calcium-binding proteins Troponin: Troponin C - binds to Ca2 ions Strong affinity of troponin to calcium initiate contraction process. Calmodulin In place of troponin, smooth muscle have calmodulin Ca2 inside cell bind reversibly with calmodulin activates myosin light chain kinase resulting in chain of events which cause muscle contraction 