Your Query returns 10 Accession Numbers:

Query Term	Accession	NCBI Taxonid	Synonyms	Phenotype (OMIM) *
Ckn1	NM_028042	10090	Csa 2410022P04Rik 2810431L23Rik 4631412O06Rik	216400
CKN1	AY213194	9606		216400
CKN1	BC009793	9606	CSA ERCC8	216400
CKN1	AY419808	9606		216400
CKN1	AY419809	9598
CKN1	AY419810	10090		216400
CKN1	NM_000082	9606	CSA ERCC8	216400
Ckn1	NT_039590	10090		216400
Ckn1	BC037200	10090	Csa	216400
CKN1	NT_006431	9606		216400

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

Text2Knowledge ... Yong Huang 2002