Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
pp21BC0008099606SIIR    p21    TCEAL1   
pp21NM_0047809606P21    SIIR    TCEAL1   
pp21BC01129010090MGC18752    P21    SIIR    Tceal1   
pp21NM_14623610090P21    SIIR    MGC18752    Tceal1   
pp21M997019606

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

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Text2Knowledge ... Yong Huang 2002