Your Query returns 13 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
upf2Z989744896SPAC19A8.08   
UPF2NC_0043547227CG2253   
UPF2NM_1322067227CG2253   
UPF2NC_0011404932IFS1    SUA1    NMD2   
UPF2U121374932
upf2AF3010144896
UPF2AF3185749606605529
UPF2NM_0805999606HUPF2    RENT2    KIAA1408    DKFZP434D222    605529
UPF2NM_0155429606HUPF2    RENT2    KIAA1408    DKFZP434D222    605529
Upf2XM_14080110090605529
Upf2NT_03920210090605529
Upf2AE0034427227
UPF2NT_0775699606605529

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

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Text2Knowledge ... Yong Huang 2002