Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
mast9NM_01009710090Sc1    Ecm2    hevin    Sparcl1   
MAST9BC0337219606HEVIN    SC1    SPARCL1   
MAST9NM_0046849606SC1    HEVIN    SPARCL1   
mast9BC00375910090Ecm2    Sc1    hevin    Sparcl1   

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

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Text2Knowledge ... Yong Huang 2002