Your Query returns 8 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Nhlh2NM_17877710090Hen2    NSCL2    Nscl-2    6230401I09Rik    162361
NHLH2AY4006479606162361
NHLH2AY4006489598
NHLH2AY40064910090162361
Nhlh2NT_03923910090162361
Nhlh2BC05841310090Hen2    Nscl-2    NSCL2    6230401I09Rik    162361
NHLH2NT_0047549606162361
NHLH2NM_0055999606HEN2    NSCL2    162361

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

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Text2Knowledge ... Yong Huang 2002