Your Query returns 26 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
MTH1NC_000916187420
Mth1NM_00863710090Nudt1    600312
MTH1BC0513759606p18    p21    p22    p26    NUDT1    600312
MTH1BC0146189606NUDT1    600312
MTH1BC0653679606NUDT1    600312
MTH1NM_0024529606NUDT1    600312
MTH1NM_1989489606NUDT1    600312
MTH1NM_1989499606NUDT1    600312
MTH1NM_1989509606NUDT1    600312
MTH1NM_1989529606NUDT1    600312
MTH1NM_1989539606NUDT1    600312
MTH1NM_1989549606NUDT1    600312
MTH1L219334932
MTH1U510304932
MTH1AE000795187420
mth1AJ2455055145
MTH1AB0252339606600312
MTH1SEG_D38591S9606600312
MTH1D385919606600312
MTH1D385929606600312
MTH1D385939606600312
MTH1D385949606600312
Mth1AF29105410090600312
MTH1G183429606600312
Mth1NM_05712010116Nudt1   
MTH1NC_0011364932DGT1    HTR1    BPC1   

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

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Text2Knowledge ... Yong Huang 2002