Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
megsinNM_02754810090ovalbumin    4631416M05Rik    Serpinb7   
MegsinNM_13040410116Serpinb7   
MEGSINNM_0037849606SERPINB7   
megsinBC06400410090ovalbumin    Serpinb7   

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

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Text2Knowledge ... Yong Huang 2002