Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
STM2BC0063659606AD3L    AD4    PS2    PSEN2    600759
STM2NM_0004479606AD4    PS2    AD3L    PSEN2    600759
STM2NM_0124869606AD4    PS2    AD3L    PSEN2    600759
STM2U508719606600759

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

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Text2Knowledge ... Yong Huang 2002