Your Query returns 18 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
smad1NM_1313567955fb39h09    wu:fb39h09    madh1   
SMAD1BC0000659606CMT2D    GARS    601595 600287
SMAD1BC0018789606JV4-1    MADR1    BSP1    MADH1    601595 600287
SMAD1BC0077229606CMT2D    GARS    601595 600287
SMAD1BC0077559606CMT2D    GARS    601595 600287
SMAD1NM_0020479606CMT2D    GARS    601595 600287
Smad1BC05869310090Mlp1    Madr1    MusMLP    Madh1    601595 600287
Smad1NM_00853910090Mlp1    Madr1    MusMLP    Madh1    601595 600287
SMAD1NM_0059009606BSP1    JV4-1    MADR1    DKFZP586M0622    MADH1    601595 600287
Smad1Y190859091
Smad1AF2159336183
SMAD1AB1061139796
smad1AH0130377955
smad1AY3092697955
smad1AY3092707955
smad1AY3092727955
Smad1AF06772710116
Smad1AF1744347955

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

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Text2Knowledge ... Yong Huang 2002