Word: nucleolus
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Dates: during 1930-1939
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...Cell (protoplasm), biologists agree, is made up of two main parts: the yolk-like nucleus and the oily cytoplasm. Both nucleus and cytoplasm contain solid and liquid portions; in addition they contain further specialized units of matter: in the nucleus, membrane, nucleolus, chromosomes; in the cytoplasm, membrane, granules, vacuoles, plastids. It is the behavior of these infinitesimal units that biologists are now trying to study...
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