Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
SIIRBC0008099606p21    pp21    TCEAL1    300237
SIIRNM_0047809606P21    pp21    TCEAL1    300237
SIIRBC01129010090MGC18752    P21    pp21    Tceal1    300237
SIIRNM_14623610090P21    pp21    MGC18752    Tceal1    300237

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

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Text2Knowledge ... Yong Huang 2002