Your Query returns 12 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Stx1b2NM_02441410090SYN1B    Stx1b   
Stx1b2NW_04756210116
Stx1b2NM_01270010116Stx2    Stx1b   
STX1B2AY4093119606
STX1B2AY4093129598
STX1B2AY40931310090
STX1B2AY0287929606
STX1B2NM_0528749606
STX1B2NM_1746189913
Stx1b2NT_03943510090
STX1B2BC0622989606
STX1B2NT_0248129606

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

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Text2Knowledge ... Yong Huang 2002