This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Memory T cells can be identified by using the following 
Select and explain. 
A. CD 45RA, B. CD45RB, C. CD45RC, D. CD45RO
D: CD45RO
Answer: D: CD45RO 
Explanation: Ref Harrison 17/e p2021 CD45 (lymphocyte common antigen) is a receptor-linked protein tyrosine phosphatase that is expressed on all leucocytes, and which plays a crucial role in the function of these cells. ... These CD45-associated molecules may play an impoant role in regulatingCD45 tyrosine phosphatase activity and function. Present on memory T cells