When grading agglutination in a gel microtubule system, which grade is described as cells and agglutinates distributed through the column?
a. 1+
b. 2+
c. 3+
d. 4+
Question 2
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
