Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
RPO21U271824932
RPO21Z741884932
RPO210N/ARPB1    SUA8    RPB220   

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

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Text2Knowledge ... Yong Huang 2002