Your Query returns 8 Accession Numbers:

Query Term	Accession	NCBI Taxonid	Synonyms	Phenotype (OMIM) *
Fcer1b	NM_013516	10090	Fce1b Ms4a1 Ms4a2	147138
FCER1B	NM_000139	9606	FCERI MS4A1 MS4A2	147138
Fcer1b	NM_012845	10116	FCIGA Ms4a1 Ms4a2
fceR1b	AJ318332	9796
fceR1b	AJ318333	9940
FCER1B	AB025257	9606		147138
FCER1B	AB042033	9606		147138
Fcer1b	AB033617	10090		147138

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

Text2Knowledge ... Yong Huang 2002