Your Query returns 10 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Chrnb1NM_00960110090Acrb    Achr-2    100710
Chrnb1NW_04733410116
CHRNB1BC0113719606CHRNB    ACHRB    100710
CHRNB1BC0235539606CHRNB    ACHRB    100710
CHRNB1NM_0007479606ACHRB    CHRNB    100710
CHRNB1NM_1745169913
Chrnb1NT_03951510090100710
Chrnb1BC02331810090100710
Chrnb1NM_01252810116Acrb    RNACRB1   
CHRNB1NT_0107189606100710

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

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Text2Knowledge ... Yong Huang 2002