Cell surface proteins

Question 1

T cells

Answer 1

TCR
CD3 (associated with TCR for signal transduction)
CD28 (bind to B7 on APC)

Helper: CD4 and CD40 ligand
Cytotoxic: CD8

Question 2

B cells

Answer 2

Ig
CD19
CD20
CD21 (receptor for EBV)
CD40

MHC II
B7 (to stimulate T cells)

Question 3

Macrophages

Answer 3

CD14 (LPS receptor)
CD40 (thus activated by TH)
MHCII
B7 (thus activate Th)
Fc and C3b receptor (enhance phagocytosis)

Question 4

NK cells

Answer 4

CD16 (bind Fc of IgG)

CD56 (unique marker for NK cells)