Your Query returns 18 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
jag2AF2294497955
Jag2NM_01058810090sm    Serh    D12Ggc2e    mJagged2-1    602570
jag2NM_1318627955serB   
jag2NM_1316657955serB   
Jag2XM_34311910116
Jag2NW_04776210116
JAG2AF0297799606602570
JAG2AF0297789606602570
jag2Y143309606602570
JAG2NM_1451599606HJ2    602570
JAG2NM_0022269606HJ2    602570
Jag2NT_03955310090602570
jag2Y1433110090602570
jag2Y1449510090602570
Jag2BC00908210090mJagged2-1    602570
Jag2BC03113410090mJagged2-1    602570
jag2AF2294507955
JAG2NT_0264379606602570

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

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Text2Knowledge ... Yong Huang 2002