<prompt> The process by which leukocytes are arranged along the endothelium is called:MarginationRollingDiapedesisChemotaxis  <response>: Ans: a Margination Ref: Robbins, 7th ed, p.The sequence of events of leukocyte journey from vessel lumen to interstitial tissue is divided into the following steps.a Margination: leukocyte accumulation along endothelial surface.b Rolling: Tumbling of leukocyte along the endothelium with transient adherence.c Adhesion: Attachment with the help of selectins integrins.d Diapedesis: Transmigration across the endotheliume Migration: To a chemotactic stimulusEndothelialLeukocyte adhesion moleculesEndotheliumLeucocyteMajor functionP. selectinSialyl Lewis XRollingE. selectinSialyl Lewis XRolling, adhesionICAM 1LFA1, MAC1AdhesionVC AM 1VLA4, LPAM1AdhesionCD31 PECAMCD31LeucocytetransmigrationGLYCAM 1, CD 34L selectinLymphocyte homing 