This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Most impoant for diapedesis ? 
Select and explain. 
A. PECAM, B. Selectin, C. Integrin, D. Mucin like glycoprotein
A: PECAM
Answer: A: PECAM 
Explanation: Ans. is 'a' i.e., PECAMo Platelet endothelial cell adhesion molecule (PECAM or CD-31) is present on both endothelium and leukocytes. o It is the major adhesive molecule for diapedisis.