来自《耶鲁大学开放课程：生物医学工程探索 第10集 第10集》

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  that your immune system keeps track of antigens
  是人体免疫系统记忆抗原的一种方法
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  that it's been exposed to for even if maybe the plasma cells
  即使由浆细胞产生的抗体
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  that were producing antibody in response to the initial exposure
  在初次免疫应答中全部被消灭
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  have died and disappeared.
  记忆细胞仍然能迅速分化为抗体分泌细胞
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  Memory cells are long lasting cells that remember
  记忆细胞可以长时间记忆与抗原的接触
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  this exposure and can respond very quickly on second exposure.
  并在再次免疫中迅速做出应答
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  We talked about antibodies,
  我们讨论过抗体
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  we talked about them two weeks ago,
  我们在两周前讨论了抗体
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  we talked about them in section last week, uses of them.
  上周的组会中我们讲到抗体的应用
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  I just want to remind you that if you
  我在此提醒下你们
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  looked at the population of antibodies inside--in your blood,
  如果你们观察在你们血液中的抗体
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  for example, the predominant antibodies would look like this.
  主要的一些抗体有以下几种