Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
POLGBBC0091949606MTPOLB    HP55    POLB    POLG2   
POLGBNM_0072159606HP55    POLB    MTPOLB    POLG2   

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

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Text2Knowledge ... Yong Huang 2002