A rhoptry is a specialized secretory organelle. They are club-shaped organelles connected by thin necks to the extreme apical pole of the parasite. These organelles, like micronemes, are characteristic of the motile stages of Apicomplexa protozoans. They can vary in number and shape and contain numerous enzymes that are released during the penetra...
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http://en.wikipedia.org/wiki/Rhoptry
Electron-dense club-shaped, tubular or saccular organelles extending back from the anterior end of sporozoites and other stages of certain sporozoans in the subphylum Apicomplexa. ... Synonym: paired organelles, toxoneme. ... Origin: G. Rhopalon, club ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
Electron-opaque dense body found in the apical complex of parasitic protozoa of the Phylum Apicomplexa.
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Type: Term Pronunciation: rōp′trē, -trēs Definitions: 1. Electron-dense club-shaped, tubular or saccular organelles, extending back from the anterior end of sporozoites and other stages of certain sporozoans in the subphylum Apicomplexa. Synonyms: paired organelles, toxoneme
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http://www.medilexicon.com/medicaldictionary.php?t=78352
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