Your Query returns 8 Accession Numbers:

Query Term	Accession	NCBI Taxonid	Synonyms	Phenotype (OMIM) *
MLH3	AB039667	9606		604395
MLH3	AF195657	9606		604395
MLH3	AF195658	9606		604395
MLH3	NM_014381	9606	HNPCC S240II117	604395
Mlh3	NT_039551	10090		604395
Mlh3	BC003865	10090		604395
MLH3	NT_026437	9606		604395
MLH3	NC_001148	4932

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

Text2Knowledge ... Yong Huang 2002