Your Query returns 16 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Chek1NM_00769110090Chk1    rad27    603078
Chek1NW_04779910116
CHEK1BC0042029606CHK1    603078
CHEK1AY3045489606CHK1    603078
CHEK1BC0175759606CHK1    603078
CHEK1AY4182819606603078
CHEK1AY4182829598
CHEK1AY41828310090603078
CHEK1AF5275559606603078
CHEK1NM_0012749606CHK1    603078
Chek1NT_03947210090603078
Chek1BC03761310090Chk1    rad27    603078
CHEK1AY33574332630
CHEK1NT_0338999606603078
Chek1NM_08040010116
CHEK1NM_2043459031

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

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Text2Knowledge ... Yong Huang 2002