While the clonal selection principle is responsible for generating the memory cell population, the immune network theory prevents the population size from increasing quickly.
克隆选择用来产生抗原的记忆细胞群体，免疫网络理论则用来抑制该群体规模的快速增长。
To develop into memory cells, B cells have to survive the natural process of apoptosis, or programmed cell death, that occurs following a large immune response.
要发育成记忆细胞，B细胞必须在细胞凋亡或程序性细胞死亡这一自然过程中生存下来，细胞凋亡则随着明显的免疫响应而出现。
To develop into memory cells, B cells have to survive the natural process of apoptosis, or programmed cell death, that occurs following a large immune response.
要发育成记忆细胞，B细胞必须在细胞凋亡或程序性细胞死亡这一自然过程中生存下来，细胞凋亡则随着明显的免疫响应而出现。
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