FUNCTION: Potassium channel subunit that does not form functional channels by itself. Can form functional heterotetrameric channels with KCNB1 and KCNB2; modulates the delayed rectifier voltage-gated potassium channel activation and deactivation rates of KCNB1 and KCNB2. {ECO:0000250|UniProtKB:O3517...
                        FUNCTION: Potassium channel subunit that does not form functional channels by itself. Can form functional heterotetrameric channels with KCNB1 and KCNB2; modulates the delayed rectifier voltage-gated potassium channel activation and deactivation rates of KCNB1 and KCNB2. {ECO:0000250|UniProtKB:O35174}.
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                        GO - Biological processes (BP): 
                        potassium ion transmembrane transport [GO:0071805]; potassium ion transport [GO:0006813]; protein homooligomerization [GO:0051260]; regulation of delayed rectifier potassium channel activity [GO:1902259]...
                        potassium ion transmembrane transport [GO:0071805]; potassium ion transport [GO:0006813]; protein homooligomerization [GO:0051260]; regulation of delayed rectifier potassium channel activity [GO:1902259]
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                        GO - Molecular function (MF): 
                        voltage-gated potassium channel activity [GO:0005249]...
                        voltage-gated potassium channel activity [GO:0005249]
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                        GO - Cellular component (CC): 
                        integral component of membrane [GO:0016021]; perinuclear region of cytoplasm [GO:0048471]; plasma membrane [GO:0005886]; voltage-gated potassium channel complex [GO:0008076]...
                        integral component of membrane [GO:0016021]; perinuclear region of cytoplasm [GO:0048471]; plasma membrane [GO:0005886]; voltage-gated potassium channel complex [GO:0008076]
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