Your Query returns 19 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
TBX1NM_01998010090N4WBP3    3222402J11Rik    Litaf    602054
TBX1BC01855910090N4WBP3    Litaf    602054
Tbx1AF5262748355
tbx1AY2776317955
Tbx1NT_08235510090602054
Tbx1NM_01153210090602054
tbx1NM_1833397955
TBX1AF0121309606602054
TBX1AF0121319606602054
Tbx1XM_14833810090602054
tbx1U5732710090602054
Tbx1NT_03962410090602054
Tbx1NT_03962810090602054
Tbx1AF34965810090602054
Tbx1AF32696010090602054
TBX1NT_0115199606602054
TBX1NM_0059929606DGS    TGA    CAFS    CTHM    DGCR    DORV    VCFS    TBX1C    602054
TBX1NM_0806479606DGS    TGA    CAFS    CTHM    DGCR    DORV    VCFS    TBX1C    602054
TBX1NM_0806469606DGS    TGA    CAFS    CTHM    DGCR    DORV    VCFS    TBX1C    602054

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

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Text2Knowledge ... Yong Huang 2002