Your Query returns 22 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
RBP4BC0104279606HSRBP4    HSRPB4    POLR2D    180250
RBP4BC0172059606HSRBP4    HSRPB4    POLR2D    180250
RBP4NM_0048059606HSRBP4    HSRPB4    POLR2D    180250
Rbp4AY0894577227
Rbp4NM_01125510090Rbp-4    180250
Rbp4XM_21528510116
Rbp4NW_04756510116
RBP4BC0206339606180250
Rbp4NG_0003357227TSR    RRM4    CG9654    CT27280   
RBP4AY4173969606180250
RBP4AY4173979598
RBP4AY41739810090180250
RBP4NM_0067449606180250
RBP4M7452710090180250
Rbp4NT_03968910090180250
Rbp4BC03180910090180250
RBP4G621639796
rbp4NM_1309207955rbp    fb58d04    fb72b04    wu:fb58d04    wu:fb72b04   
Rbp4AE0037017227
RBP4NT_0300599606180250
Rbp4NM_0575877227TSR    RRM4    CG9654   
Rbp4NT_0337777227TSR    RRM4    CG9654   

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

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Text2Knowledge ... Yong Huang 2002