Your Query returns 6 Accession Numbers:
Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
nifS1BX927151196627
nifS1BX572601258594
nifS1AE000720224324aq_1053   
nifS1AE000657224324aq_1053   
nifS1NC_000918224324
nifS1NC_005296258594

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

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Text2Knowledge ... Yong Huang 2002