When one drug increases the effectiveness of another drug, this is called ____.

Which of the following markers would be helpful in differentiating cortical T-cell ALL from medullary T-cell ALL?

a. HLA-DR b. TdT c. CD2 d. CD1a

________ is a topical pain anesthetic used before venipuncture in a child.

Fill in the blank(s) with the appropriate word(s).