A protein or substance found in or related to capsules, particularly in bacterial or plant cell structures.
From capsule plus the suffix -in (common in biochemistry for proteins and substances). This technical term appears in microbiology literature for capsule-associated compounds.
When scientists study why some bacteria are so hard to kill, they often focus on 'capsumin' compounds—these slippery proteins are like a bacterial armor that lets dangerous microbes slip past your white blood cells undetected.
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