Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
l(2)01857NM_13645072271857    CYTB5    CG2140    Cyt-b5   
l(2)01857NM_16554072271857    CYTB5    CG2140    Cyt-b5   
l(2)01857NT_03377872271857    CYTB5    CG2140    Cyt-b5   

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

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Text2Knowledge ... Yong Huang 2002