Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
U1RNPBC0003429606RNPU1Z    RPU1    U170K    U1AP    SNRP70    180740
U1RNPBC0013159606RNPU1Z    RPU1    U170K    U1AP    SNRP70    180740
U1RNPNM_0030899606RPU1    U1AP    U170K    RNPU1Z    SNRP70    180740

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

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Text2Knowledge ... Yong Huang 2002