Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Kcnb3NM_01059810090F5    I2rf5    Kcnab2   
KCNB3NM_0143799606HNKA    KV2.3    KV8.1    KCNV1   
KCNB3BC0287399606HNKA    KV8.1    KV2.3    KCNV1   

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* OMIM link based on symbol match for human and mouse.

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Text2Knowledge ... Yong Huang 2002