Your Query returns 10 Accession Numbers:

Query Term	Accession	NCBI Taxonid	Synonyms	Phenotype (OMIM) *
Rgn	NM_009060	10090	SMP30	300212
Rgn	NW_048034	10116
Rgn	NM_031546	10116	Rc Reguc
RGN	NM_004683	9606	RC SMP30	300212
RGN	NM_152869	9606	RC SMP30	300212
RGN	NM_173957	9913
Rgn	NT_039700	10090		300212
Rgn	BC012710	10090	SMP30	300212
RGN	NT_011568	9606		300212
RGN	NM_205746	7955

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

Text2Knowledge ... Yong Huang 2002