Your Query returns 22 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Cdkn1aNM_00766910090P21    CDKI    CIP1    SDI1    Waf1    mda6    CAP20    Cdkn1    p21WAF    p21Cip1    116899
Cdkn1aNW_04759710116
CDKN1ABC0139679606CAP20    CDKN1    CIP1    P21    SDI1    WAF1    MDA-6    116899
CDKN1ABC0002759606CAP20    CDKN1    CIP1    P21    SDI1    WAF1    MDA-6    116899
CDKN1ABC0003129606CAP20    CDKN1    CIP1    P21    SDI1    WAF1    MDA-6    116899
CDKN1ABC0019359606CAP20    CDKN1    CIP1    P21    SDI1    WAF1    MDA-6    116899
CDKN1AZ859969606116899
CDKN1AAY3993429606116899
CDKN1AAY3993439598
CDKN1AAY39934410090116899
CDKN1AAF4979729606116899
CDKN1ANM_0003899606P21    CIP1    SDI1    WAF1    CAP20    CDKN1    MDA-6    116899
CDKN1ANM_0784679606P21    CIP1    SDI1    WAF1    CAP20    CDKN1    MDA-6    116899
Cdkn1aNT_03964910090116899
Cdkn1aAH01132110090Waf1    116899
Cdkn1aAF45718710090Waf1    116899
Cdkn1aAF45718810090Waf1    116899
Cdkn1aBC00204310090P21    CIP1    SDI1    Waf1    mda6    CAP20    p21WAF    p21Cip1    CDKI    116899
CDKN1AAY33560532630
Cdkn1aNM_08078210116Cip1    Waf1   
CDKN1AAJ6291849823
CDKN1ANT_0075929606116899

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

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Text2Knowledge ... Yong Huang 2002