Your Query returns 6 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
53BP2NM_17337810090ASPP2    Tp53bp2    AI746547    PPP1R13A    Trp53bp2   
53BP2BC0589189606PPP1R13A    ASPP2    TP53BP2   
53BP2BC0461509606PPP1R13A    ASPP2    TP53BP2   
53BP2NM_0054269606ASPP2    PPP1R13A    TP53BP2   
53BP2BC03089410090Tp53bp2    ASPP2    PPP1R13A    Trp53bp2   
53BP2BC04287410090Tp53bp2    ASPP2    PPP1R13A    Trp53bp2   

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

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Text2Knowledge ... Yong Huang 2002