Your Query returns 14 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
htr1BAY3239099615
HTR1BAB0413709606182131
Htr1bNM_01048210090182131
HTR1BAB0413719598
HTR1BAB0413729593
Htr1bNW_04780010116
HTR1BAL0495959606182131
HTR1BAY4156059606182131
HTR1BAY4156069598
HTR1BAY41560710090182131
HTR1BNM_0008639606S12    HTR1D2    HTR1DB    182131
Htr1bNT_03947510090182131
HTR1BNT_0072999606182131
Htr1bNM_02222510116

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

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Text2Knowledge ... Yong Huang 2002