Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
1857NM_1364507227CYTB5    CG2140    l(2)01857    Cyt-b5   
1857NM_1655407227CYTB5    CG2140    l(2)01857    Cyt-b5   
1857NT_0337787227CYTB5    CG2140    l(2)01857    Cyt-b5   

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

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Text2Knowledge ... Yong Huang 2002