When the body first encounters a foreign antigen, a primary immune response is stimulated. One of the residual effects of the primary response is the retention of which memory cells?
A. B
B. D
C. X
D. Y
Answer:A
When the body first encounters a foreign antigen, a primary immune response is stimulated. One of the residual effects of the primary response is the retention of which memory cells?
A. B B. D C. X D. Y