Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Nos-1NM_00871210090NO    bNOS    nNOS    Nos1   
nos-1NC_0032806239R03D7.7   
nos-1NM_0639576239R03D7.7   
Nos-1L2380610090
nos-1Z468286239

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

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Text2Knowledge ... Yong Huang 2002