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Narrow, electron-dense part of the rhoptry that extends through the conoid at the apical tip of an apicomplexan parasite. The rhoptry neck serves as a duct through which the contents of the rhoptry are secreted after attachment to the host has been completed and at the commencement of invasion. [GOC:giardia, GOC:pr, PMID:23499754, PMID:23937520, PMID:24002067, PMID:24070999]
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