Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Polg2NM_01581010090
POLG2BC0091949606MTPOLB    HP55    POLB    POLGB   
POLG2NM_0072159606HP55    POLB    POLGB    MTPOLB   
Polg2NT_03952110090
POLG2NT_0107839606

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

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Text2Knowledge ... Yong Huang 2002