Englishfor English speakers
antigen
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noun
any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies)
specific
Adjective
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A specific idea, person, group etc. is the one that is of interest, or when someone knows exactly which one they're talking about.
The interviewer uses a checklist to make sure that specific areas are covered.
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If something is specific, it is detailed, clear, and limited.
Last time, he was happy to do anything, but feels this time he has to be more specific.
First I will talk about farming in general, and then I will talk about the specific problems of wheat farming.
cell
Noun
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A cell is a room in a jail where prisoners are kept.
He was arrested and kept in a small cell for one day.
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A cell is a unit of a living organism.
A plant cell has a cell wall.