Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
PROS-Dm28.1NM_0803537227CG3422    Pros28    pros28.1    PROS-28.1    alpha4_dm    PROSA-28.1    20S proteasome   
PROS-Dm28.1X622867227

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

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Text2Knowledge ... Yong Huang 2002