Your Query returns 17 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
mtx1NM_1315607955sb:cb779    mxtx1   
MTX1NM_01729910116Slc19a1   
Mtx1AB1260071421
mtx1AF5389281421
MTX1BC0019069606MTX    MTXN    600605
MTX1AY3999309606600605
MTX1AY3999319598
MTX1AY39993210090600605
MTX1NM_0024559606MTX    MTXN    600605
MTX1NM_1988839606MTX    MTXN    600605
Mtx1NT_07838610090600605
MTX1AF09900910116
Mtx1BC02307110090Mtx    600605
mtx1AB0342457955
MTX1NT_0794849606600605
mtx1AY3519587955
Mtx1NM_01360410090Mtx    Gcap6    600605

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

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Text2Knowledge ... Yong Huang 2002