A.骨髓 B.法氏囊 C.脾臟 D.胸腺皮質(zhì)區(qū) E.淋巴結(jié)副皮質(zhì)區(qū)
A.CD2 B.CR2 C.MHC-Ⅰ類分子 D.MHC-Ⅱ類分子 E.LFA-3
A.45%~55% B.55%~65% C.65%~75% D.35%~45% E.75%~85%