A.B7-CD28 B.ICAM-LFA1 C.CD40-CD40L D.LFA3-CD2
A.CD2-LFA3 B.CD28-B7 C.LFA1-ICAM D.VLA-4—VCAM1
A.TCR識(shí)別抗原肽 B.MHCⅡ類分子識(shí)別抗原肽 C.TCR識(shí)別MHCⅡ類分子 D.TCR識(shí)別抗原肽-MHCⅡ類分子復(fù)合物