Your Query returns 45 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
nifAJ03411354
nifAD13799193
nifAL11084384
nifAU3163029449
nifAU5074933965
nifAAE000100394
nifAM60319964
nifAAF1459561085
nifAAP005942224911
nifAAF222753133505
nifAAF03041433996
nifAAF311738381
nifAAE007235382SMa0815   
nifAX89104549
nifAX99694549
nifAX05049384
nifAAJ520101387
nifAAJ297529316
nifAX60714192
NIFABX571660844
nifAAE012909194439CT1529   
nifAAF51856062928
nifAAE000678224324aq_218   
nifAAE011206189518
nifAU8092829449RESP0089R. RetliDB:RE1SP0000089   
nifAAF288483192
nifAAE000657224324aq_218   
nifAAH010242375
nifAAF322013375
nifAAY237648227048
nifANC_000914394
nifANC_004463224911
nifANC_000918224324
nifANC_00404129449RESP0089R. RetliDB:RE1SP0000089   
nifANC_002932194439CT1529   
nifANC_004342189518
NIFANC_005090844
nifABX572607258594
nifANC_005363264462
nifANC_005363264462
nifANC_005296258594
nifANC_003037266834
nifAAJ5632894874
nifABX842646264462
nifABX842654264462

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

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Text2Knowledge ... Yong Huang 2002