2. Which of the following three answer can be accurately called a cytokine? (5 Points)
a) Cell surface antigen receptor on lymphocyte
b) An antibody secreted by a B cell
c) A protein secreted from T lymphocyte that activate a macrophage
d) A lipid secreted by a Natural Killer cell that activates a B cell
e) A protein that mediate much of the intercellular communication that is required for
effective immune responses.
f) There are many cytokines produced by many cell types
g) A nuclear protein that regulates lymphocyte gene expression