<prompt> Chemotaxis is the main function of?C5aICAM1P-selectinIL-5  <response>: Ans. is a i.e., C5a o C5a is the most powerful chemo-attractant chemokine.Chemotaxiso Chemotaxis is unidirectional locomotion of leukocytes towards the site of injury, oriented along a chemical gradient. This chemical gradient is created by substances called chemoattractants chemotactic agents, which may be exogenous bacterial products or endogenous C5a, LTB-4, IL-1, TNF, IL-8. 