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is one-millionth of a metre or one-thousandth of a millimetre (0,001 mm). Its unit symbol in the International System of Units (SI) is µm.
a non-membrane bound structure made of proteins and nucleic acids that occurs within the nucleus...
the actions of the body's immune system that work to fight infections or disease.
(also called selectively permeable membrane) a membrane which allows some substances to cross it...