Your Query returns 27 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
CHK2NM_01668110090Cds1    Rad53    HUCDS1    Chek2    604373
CHK2BC0042079606CDS1    HuCds1    PP1425    RAD53    bA444G7    CHEK2    604373
CHK2NM_0071949606CDS1    RAD53    HuCds1    PP1425    bA444G7    CHEK2    604373
CHK2NM_1458629606CDS1    RAD53    HuCds1    PP1425    bA444G7    CHEK2    604373
CHK2BC05661710090Cds1    HUCDS1    Chek2    604373
Chk2NM_05367710116Rad53   
Chk2NM_0578707227chk    mnk    Dmnk    loki    38B.4    DmChk2    Dmnk-L    Dmnk-S    CG10895    LOKI/CHK2    lok   
Chk2NM_0578717227chk    mnk    Dmnk    loki    38B.4    DmChk2    Dmnk-L    Dmnk-S    CG10895    LOKI/CHK2    lok   
Chk2NM_1653187227chk    mnk    Dmnk    loki    38B.4    DmChk2    Dmnk-L    Dmnk-S    CG10895    LOKI/CHK2    lok   
Chk2NT_0337797227chk    mnk    Dmnk    loki    38B.4    DmChk2    Dmnk-L    Dmnk-S    CG10895    LOKI/CHK2    lok   
chk2U698875476
Chk2AB0401059606604373
CHK2AF0869049606604373
CHK2AF1741359606604373
CHK2AL1173309606604373
Chk2AF08690510090604373
CHK2AY5512959606604373
CHK2AY5512969606604373
CHK2AY5512979606604373
CHK2AY5512989606604373
CHK2AY5512999606604373
CHK2AY5513009606604373
CHK2AY5513019606604373
CHK2AY5513029606604373
CHK2AY5513039606604373
CHK2AY5513049606604373
CHK2AY5513059606604373

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

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Text2Knowledge ... Yong Huang 2002