Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Hen2NM_17877710090NSCL2    Nscl-2    6230401I09Rik    Nhlh2    162361
Hen2BC05841310090Nscl-2    NSCL2    6230401I09Rik    Nhlh2    162361
HEN2NM_0055999606NSCL2    NHLH2    162361
HEN2AY0506583702
HEN2M975089606162361

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

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Text2Knowledge ... Yong Huang 2002