Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Ctla-1NM_01354210090CCP1    Ctla1    CCP-1/C11    Gzmb   
CTLA-1U0570710090
CTLA-1U0570810096

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

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Text2Knowledge ... Yong Huang 2002