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metal ion binding (GO:0046872)
Interacting selectively and non-covalently with any metal ion.
Specific
alkali metal ion binding (GO:0031420)
calcium ion binding (GO:0005509)
lead ion binding (GO:0032791)
magnesium ion binding (GO:0000287)
metal chelating activity (GO:0046911)
transition metal ion binding (GO:0046914)
General
cation binding (GO:0043169)
References
gene ontology: GO:0046872