a:  memory T-cells ~
b:  stored number
What:  
"These memory T-cells are like a stored number on your cell phone; they are programmed to respond to a specific threat that has previously invaded the body.11 These memory T-cells are now programmed to respond to known threats, but will not rally to head off a new, unknown threat."
Useful?
Writer:  Richard Stanton
LCC: 
Where:
Date:   May 27 2016  9:27 PM
# 10000 Critique Analogy
