Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Nos-2NM_01092710090iNOS    NOS-II    Nos2   
nos-2U587586239
nos-2NC_0032806239ZK1127.1    CELK06095   
nos-2NM_0630516239ZK1127.1    CELK06095   
NOS-2U6128210116

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

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Text2Knowledge ... Yong Huang 2002