Your Query returns 22 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Stx1bNM_02441410090SYN1B    Stx1b2    601485
Stx1bNM_01270010116Stx2    Stx1b2   
stx1BAP005153194948
stx1BAJ413275173830
stx1BAP00040083334
stx1BAB071620562
stx1BAB071622562
stx1BAB071624562
stx1BAB119461562
stx1BAE005442155864Z3343   
stx1BAJ251325562
stx1BAJ251754562
stx1BAF461166562
stx1BAF461168562
stx1BAF461169562
stx1BAF461172562
stx1BAY135685562
stx1BAY123841562
stx1BAY123842562
stx1BAE00517483334Z3343   
stx1BNC_002655155864
stx1BNC_004913194948

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

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Text2Knowledge ... Yong Huang 2002