問題詳情
20. Which one of the following properties is the feature of B-1 cells?
(A) IL-7 dependent
(B) Main secretion is IgM and first produced at fetus
(C) Mode of renewal is long-lived
(D) Primary location is spleen
(E) Somatic hypermutation is high.
參考答案
答案：99
統計：A:0,B:0,C:0,D:0,E:1
難度：計算中