Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Pro1278AE017164167539
Pro1278NC_005042167539
PRO1278BC0150139606HT015    MSC    PRO1584    MSCP   
PRO1278NM_0185799606MSC    HT015    PRO1584    MSCP   
PRO1278NM_0166129606MSC    HT015    PRO1584    MSCP   

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

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Text2Knowledge ... Yong Huang 2002