Your Query returns 6 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
NR1B2BC0504159606HAP    RRB2    RARB   
NR1B2BC0607949606HAP    RRB2    RARB   
NR1B2NM_0161529606HAP    RRB2    RARB   
Nr1b2NM_01124310090Hap    RARbeta2    A830025K23    Rarb   
NR1B2NM_0009659606HAP    RRB2    RARB   
NR1B2AF1574839606

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

Google

Text2Knowledge ... Yong Huang 2002