Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
NSG1BC0017459606D4S234    P21    D4S234E   
NSG1NM_0143929606P21    D4S234    D4S234E   
Nsg1NM_01094210090p21    m234   
Nsg1NT_03930310090
Nsg1BC00827210090p21    m234   

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

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Text2Knowledge ... Yong Huang 2002