
Endocytosis is an energy-using process by which cells absorb molecules (such as proteins) by engulfing them. It is used by all cells of the body because most substances important to them are large polar molecules that cannot pass through the hydrophobic plasma or cell membrane. The opposite process is exocytosis. ...
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http://en.wikipedia.org/wiki/Endocytosis

(from the article `virus`) ...enclosed not by walls but by a flexible lipoprotein bilayer membrane. Most animal viruses, whether or not they are encased in lipid envelopes, ... [5 related articles]
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http://www.britannica.com/eb/a-z/e/29

A process whereby cells engulf and take in material that lies outside their cell membranes. Endocytosis involves the formation of a vesicle called an endosome from part of the cell membrane. The food is eventually engulfed into the vesicle, which then moves further into the cell where it meets a lys...
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http://www.daviddarling.info/encyclopedia/E/endocytosis.html

Uptake of material into a cell by the formation of a membrane bound vesicle. ... (18 Nov 1997) ...
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(en″do-si-to´sis) the uptake by a cell of material from the environment by invagination of the plasma membrane; it includes both phagocytosis and pinocytosis.
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http://www.encyclo.co.uk/local/21001

Ingestion of particulate matter, fluid or virus by phagocytosis or pinocytosis; i.e., bringing material into a cell by invagination of its surface membrane, then pinching off the invaginated portion as a vacule.
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Uptake of material into a cell by the formation of a membrane-bound vesicle.
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Type: Term Pronunciation: en′dō-sī-tō′sis Definitions: 1. Internalization of substances from the extracellular environment through the formation of vesicles formed from the plasma membrane. There are two forms: (a) fluid phase (pinocytosis), and (b) receptor mediated.
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http://www.medilexicon.com/medicaldictionary.php?t=29084

(en;do-si-to;sis) A general term for the cellular uptake of particles that are too large to cross the cell membrane. See also phagocytosis and pinocytosis.
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http://www.mhhe.com/biosci/abio/glossary.mhtml

Cellular ingestion of macromolecules by invagination of plasma membrane to produce an intracellular vesicle that encloses the ingested material.
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http://www.roitt.com/glossary.asp

The process in which cells take in fluids or other large molecules.
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http://www.virology.net/ATVGlossary.html

the uptake of molecules through plasma membrane invagination and vacuole/vesicle formation
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https://courses.lumenlearning.com/microbiology/chapter/glossary/

The incorporation of materials from outside the cell by the formation of vesicles in the plasma membrane. The vesicles surround the material so the cell can engulf it.
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https://www.encyclo.co.uk/local/21571

the transport of solid matter or liquid into a cell by means of a coated vacuole or vesicle (distinguished from exocytosis). Cf. phagocytosis, pinocytosis.
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https://www.infoplease.com/dictionary/endocytosis
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