Your Query returns 24 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
smad2NM_1313667955madh2   
Smad2NM_01075410090Madr2    Madh2    601366
SMAD2BC0148409606JV18    JV18-1    MADR2    MADH2    601366
SMAD2BC0256999606JV18    JV18-1    MADR2    MADH2    601366
SMAD2NM_0059019606JV18    MADR2    JV18-1    MADH2    601366
Smad2BC02134210090Madr2    Madh2    601366
Smad2NC_0043547227Sad    ted    tmp    smox    CG2262    DSMAD2    l(1)G0348   
Smad2NM_0785247227Sad    ted    tmp    smox    CG2262    DSMAD2    l(1)G0348   
smad2AF1013867227
Smad2AF2159346183
Smad2AF2320256183
Smad2AB0719499796
Smad2AH0064889606601366
Smad2U787269606601366
Smad2U787279606601366
Smad2U787289606601366
Smad2U787299606601366
Smad2U787309606601366
Smad2U787319606601366
Smad2U787329606601366
Smad2U787339606601366
Smad2AB01791210116
Smad2AF05600110116
smad2AF1687747955

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

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Text2Knowledge ... Yong Huang 2002