Your Query returns 8 Accession Numbers:

Query Term	Accession	NCBI Taxonid	Synonyms	Phenotype (OMIM) *
Smad3	NM_016769	10090	Madh3	603109
SMAD3	BC050743	9606	JV15-2 HsT17436 MADH3	603109
SMAD3	NM_005902	9606	JV15-2 HsT17436 MADH3	603109
Smad3	BC066850	10090	Madh3	603109
Smad3	AB052738	9823
smad3	AB008192	10090		603109
Smad3	AJ004891	10090	Smad4	603109
smad3	AJ311059	8355

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

Text2Knowledge ... Yong Huang 2002