Your Query returns 8 Accession Numbers:

Query Term	Accession	NCBI Taxonid	Synonyms	Phenotype (OMIM) *
Man2b1	NM_010764	10090	LAMAN	248500
MAN2B1	BC000736	9606	LAMAN MANB	248500
MAN2B1	NM_000528	9606	MANB LAMAN	248500
MAN2B1	NM_174561	9913
Man2b1	U29947	10090		248500
Man2b1	NT_039467	10090		248500
Man2b1	BC005430	10090	LAMAN	248500
MAN2B1	NT_011295	9606		248500

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

Text2Knowledge ... Yong Huang 2002