These foreign materials are called antigens.

这些外源物质被称作抗原。

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It was soon clear that specific antibodies could be induced against a vast range of substances, called antigens because they could stimulate antibody generation.

后来人们很快明白，很多物质都可以诱导产生特异性抗体，这些物质因其可以刺激抗体的产生而被称之为抗原。

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These molecules, known as antigens, are picked up by so-called antigen-presenting cells that display them on their surfaces and show them to the helper cells.

这些我们成为抗原的分子被一些称作受体细胞所吸收，并将它们吸附在自身表面暴露给助细胞。

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When they do that they can actually engulf the bacteria in a process called phagocytosis and break them down into antigens.

免疫细胞确实是将细菌整个吞进了肚内,这一过程称为吞噬作用,并将细菌分解成小抗原

耶鲁公开课 - 生物医学工程探索课程节选

Such traits -- whether of viruses, ragweed pollen or cancer -- are called antigens.

FORBES: In search of antigens

The researchers' thinking went as follows: antibodies are designed to lock on to specific parts of larger molecules called antigens, just as a key fits a particular lock.

ECONOMIST: Microscopy