Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
HSMAD2BC0059459606MAD2    MAD2L1   
HSMAD2BC0003569606MAD2    MAD2L1   
HSMAD2NM_0023589606MAD2    MAD2L1   
hsMAD2AB0561609606
hsMAD2U654109606

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

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Text2Knowledge ... Yong Huang 2002