The term C3 convertase may refer to:
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C3-convertase
C3 convertase (''C4bC2b'', formerly ''C4b2a'') belongs to family of serine proteases and is necessary in innate immunity as a part of the complement system which eventuate in opsonisation of particles, release of inflammatory peptides, C5 conve ...
, an enzyme
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Alternative-complement-pathway C3/C5 convertase, an enzyme
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