A protein subunit that is the building block of a viral capsid, the protective protein shell surrounding a virus.
Formed from capsid (the viral protein coat) and -mer, from Greek 'meros' meaning part. This technical term emerged in virology in the mid-20th century.
Capsomers are like the LEGO bricks of viruses—they snap together in precise geometric patterns to create perfect icosahedrons or cylinders that protect the virus's genetic material, which is why some viruses look like tiny soccer balls!
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