: the protein shell of a virus particle surrounding its nucleic acid
Examples of capsid in a Sentence
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Once inside the host cell, the capsid is shed, and the virus begins copying itself.—New Atlas, 26 July 2025 Individuals who test positive for Epstein–Barr virus (EBV) capsid antigen (VCA-IgA) antibodies were found to have a higher risk of developing cancers such as lung cancer, liver cancer, nasopharyngeal carcinoma and lymphoma, according to a study shared by IARC with Newsweek.—Jasmine Laws, MSNBC Newsweek, 10 July 2025 Researchers had long thought that capsid proteins—which link together to form a protective shell, known as a cone, around the RNA—simply fell apart after infecting a cell.—Jon Cohen, New Yorker, 24 June 2025 Many other viruses have their own capsid proteins, which form a shell around their genetic material, so this drug’s triumph raises the exciting prospect that similar capsid inhibitors could fight other viral diseases.—science.org, 12 Dec. 2024 Our language model also identified a novel viral capsid protein that is widespread in the global oceans.—Libusha Kelly, The Conversation, 15 May 2024 Viruses are faced with the engineering challenge of building capsids from proteins whose entire genome must be enclosed within the small interior of the capsid.—Judith Graf, The New York Review of Books, 1 Dec. 2022
Word History
Etymology
French capside, from Latin capsa case + French -ide-id entry 2
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