Your Query returns 7 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
MYPT1NM_0024809606MBS    PPP1R12A    602021
MYPT1AF4585899606PPP1R12A    602021
MYPT1AB0421969606602021
Mypt1NW_04777410116
MYPT1AB04228010090602021
MYPT1AB04228110090602021
Mypt1NM_05389010116M110   

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

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Text2Knowledge ... Yong Huang 2002