Your Query returns 15 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Jag1NM_01382210090Htu    Ser-1    slalom    Serrate-1    Headturner    601920
jag1NM_1318617955
Jag1NW_04765810116
Jag1NM_01914710116
JAG1AF0038379606601920
JAG1AL0354569606601920
JAG1AY4175619606601920
JAG1AY4175629598
JAG1AY41756310090601920
JAG1NM_0002149606AGS    AHD    AWS    HJ1    JAGL1    601920
Jag1NT_07837810090601920
Jag1AF17109210090601920
Jag1BC05867510090Ser-1    Serrate-1    slalom    Headturner    601920
jag1AF2294487955
JAG1NT_0113879606601920

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

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Text2Knowledge ... Yong Huang 2002