Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
RNA polIING_0001417227H5    II    wimp    polII    CG3180    PolIIc    CT10661    DmRP140    RNAP II    RPII140    RNApolII    RNA pol II    l(3)RplII140    RNA polymerase II    RNA polymerase II second largest subunit   
RNA polIING_0007507227RPB3    br17    l34Dg    polII    CG7885    rpII33    CT23860    l(2)34Dg    l(2)br17    RNA pol II    l(2)k05605    BG:DS00941.10    RNA polymerase II   
RNA POLIIU58510227086

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

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Text2Knowledge ... Yong Huang 2002