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现代免疫学认为(1),机体的免疫活性细胞主要是淋巴细胞,在抗原的作用下可产生体液免疫反应和细胞免疫反应。体液免疫的效应物——抗体由 B 淋巴细胞和浆细胞合成,B 细胞在鸟类是由法氏囊(Bursa of Fabricius)衍生,而在人类相当于法氏囊的结构尚未清楚,一般认为 B 细胞衍生于骨髓。细胞免疫主要由 T 淋巴细胞负担,T 细胞在鸟类及人类都是由胸腺
Modern immunology (1), the body’s immune cells are mainly lymphocytes, the role of antigens can produce humoral and cellular immune response. The humoral immune effector - antibodies are synthesized by B lymphocytes and plasma cells, B cells are derived from Bursa of Fabricius in birds, and the structure of human equivalent to bursa is not yet known. It is generally accepted that B Cells are derived from bone marrow. Cellular immunity is mainly borne by T lymphocytes, T cells in both birds and humans by the thymus