Your Query returns 12 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Cnn1NM_00992210090CN    CnnI    600806
Cnn1NW_04779810116
CNN1BC0220159606SMCC    Sm-Calp    600806
CNN1BC0363079606SMCC    Sm-Calp    600806
CNN1AY4148589606600806
CNN1AY4148599598
CNN1AY41486010090600806
CNN1NM_0012999606SMCC    Sm-Calp    600806
Cnn1NT_03947210090600806
CNN1NT_0112959606600806
Cnn1NM_03174710116
Cnn1BC06180910116

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

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Text2Knowledge ... Yong Huang 2002