Your Query returns 14 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
GRIN1NM_01201410090Z16    Gprin1    138249
GRIN1BC05704410090Z16    Gprin1    138249
GRIN1U081069606138249
GRIN1U081079606138249
Grin1NM_00816910090NR1    Nmdar    NMDAR1    GluRdelta1    138249
Grin1NW_04765110116
GRIN1NM_0008329606NR1    NMDA1    NMDAR1    138249
GRIN1NM_0073279606NR1    NMDA1    NMDAR1    138249
GRIN1NM_0215699606NR1    NMDA1    NMDAR1    138249
Grin1NT_03920610090138249
Grin1AY15751510116NMDAR1   
Grin1BC03915710090NR1    NMDAR1    GluRdelta1    138249
Grin1NM_01701010116NR1   
GRIN1NT_0240009606138249

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

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Text2Knowledge ... Yong Huang 2002