Your Query returns 6 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Oas1aNM_01185210090L2    Mmu-L    Oias1    Mmu-L2    Oias-1    Oas1g   
Oas1aBC01847010090Mmu-L    Mmu-L2    L2    Oas1g   
Oas1aNM_14521110090L3   
Oas1aNT_08072810090
Oas1aBC01371510090
Oas1aBC05787810090

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

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Text2Knowledge ... Yong Huang 2002