Your Query returns 7 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
C20orf18BC0152199606XAP4    UBCE7IP3    RNF54   
C20orf18BC0009839606XAP4    UBCE7IP3    RNF54   
C20orf18NM_0064629606XAP4    RNF54    UBCE7IP3   
C20orf18NM_0312289606XAP4    RNF54    UBCE7IP3   
C20orf18NM_0312299606XAP4    RNF54    UBCE7IP3   
C20orf18NM_0312279606XAP4    RNF54    UBCE7IP3   
C20orf18NT_0113879606

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

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Text2Knowledge ... Yong Huang 2002