Your Query returns 11 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
MYST1Y168483702
Myst1NM_02637010090MOF    D7Ertd629e    2010203C02Rik    5830450F21Rik   
MYST1BC0377739606FLJ14040    MOF    hMOF   
MYST1AY4093029606
MYST1AY4093039598
MYST1AY40930410090
MYST1AF2175019606
MYST1NM_0321889606MOF    hMOF    FLJ14040   
Myst1NT_03943510090
Myst1BC03628410090MOF   
MYST1NT_0248129606

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

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Text2Knowledge ... Yong Huang 2002