This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
Most impoant adhesion molecule for diapedesis 
Select and explain. 
A. PECAM, B. Selectin, C. Integrin, D. Mucin like glycoprotien
A: PECAM
Answer: A: PECAM 
Explanation: CD31 or PECAM-1 (platelet endothelial cell adhesion molecule). is the most impoant molecule for diapedesisRobbins 9the p.76 -77