Your Query returns 18 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
cdkn2BAJ2427889823
CDKN2BAJ5118639823
CDKN2BAJ3160669823
Cdkn2bNM_00767010090p15    MTS2    p15INK4b    600431
Cdkn2bNW_04771610116
CDKN2BBC0144699606INK4B    MTS2    P15    TP15    600431
CDKN2BAF0587589606600431
CDKN2BAF5138589606600431
CDKN2BNM_0049369606P15    MTS2    TP15    INK4B    600431
CDKN2BNM_0784879606P15    MTS2    TP15    INK4B    600431
Cdkn2bAF05956710090600431
Cdkn2bNT_03927110090600431
Cdkn2BAF01546010090600431
Cdkn2bAF47497810116Ink4b   
Cdkn2bAF47497910116Ink4b   
Cdkn2bBC00201010090p15    MTS2    p15INK4b    600431
CDKN2BNT_0084139606600431
Cdkn2bNM_13081210116p15   

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

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Text2Knowledge ... Yong Huang 2002