Your Query returns 8 Accession Numbers:

Query Term	Accession	NCBI Taxonid	Synonyms	Phenotype (OMIM) *
RHEB2	BC016155	9606	RHEB	601293
RHEB2	BC066307	9606	RHEB	601293
RHEB2	NM_005614	9606	RHEB	601293
RHEB2	AC005996	9606		601293
RHEB2	AY407934	9606		601293
RHEB2	AY407935	9598
RHEB2	AY407936	10090		601293
RHEB2	AF493921	9606		601293

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

Text2Knowledge ... Yong Huang 2002