Your Query returns 27 Accession Numbers:
Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Hba1NM_00821810090Hba-a1    141800
Hba1BC04302010090Hba-a1    141800
HBA1AY01602339110
hbA1AJ4397326426
hbA1AY273262227881
hba1U387834896
hba1AL0786274896caf1    SPBC365.13c   
HBA1M234549606141800
HBA1M126049606141800
HBA1J001579606141800
HBA1M134799606141800
Hba1NW_04733410116
HBA1AE006462960616pHQG;13    141800
Hba1NT_07968910116
Hba1NM_01309610116HBAM   
HBA1AY1787339606HBA1-Winnipeg    141800
HBA1AY1967879606HBA1-J-Meerut    141800
HBA1AF0976359606141800
HBA1AF1059749606141800
HBA1AF2812589606141800
HBA1AF3511279606141800
HBA1AF3495719606141800
HBA1NG_0000069606141800
HBA1NM_0005589606141800
Hba1BC05915010116HBAM   
hba1NC_0034234896SPBC365.13c   
HBA1NT_0378879606141800

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

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Text2Knowledge ... Yong Huang 2002