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Category:GO:0042603 ! capsule
name: capsule
namespace: cellular_component
alt_id: GO:0030113
alt_id: GO:0042604
def: "A protective structure surrounding some fungi and bacteria, attached externally to the cell wall and composed primarily of polysaccharides. Capsules are highly organized structures that adhere strongly to cells and cannot be easily removed. Capsules play important roles in pathogenicity, preventing phagocytosis by other cells, adherance, and resistance to dessication." [GOC:mlg]
xref: Wikipedia:Capsule_(microbiology)
is_a: GO:0030112 ! glycocalyx
AmiGO
<GOterm>GO:0042603</GOterm>
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Usage Notes
In bacteria, capsule was operationally defined as something that prevents agglutination of bacteria by O antisera. Capsular antigens include both polysaccharides and proteins, such as fimbriae.
References
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