Chelator

UCLAstudent

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Something that chelates calcium will bind with it to form a ring and make calcium unable to do anything. (EGTA, for example, chelates calcium.) As a side note, if you add EGTA to tissue in vitro, calcium-mediated exocytosis won't be able to occur (i.e. at synapses, in the acrosome reaction when a sperm fertilizes an egg).
 
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