Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
PROS-28.1NM_0803537227CG3422    Pros28    pros28.1    alpha4_dm    PROSA-28.1    PROS-Dm28.1    20S proteasome   
PROS-28.1NC_0043547227a4    CG3422    Pros28    pros28.1    alpha4_dm    PROSA-28.1   
PROS-28.1NM_0803537227a4    CG3422    Pros28    pros28.1    alpha4_dm    PROSA-28.1   

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

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Text2Knowledge ... Yong Huang 2002