Your Query returns 14 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
gch1AY1208521140SEC0031   
GCH1AH0053629606600225
GCH1U192569606600225
GCH1U192579606600225
GCH1U192589606600225
GCH1U192599606600225
GCH1BC0254159606DYT5    GCH    GTPCH1    600225
GCH1AY4106379606600225
GCH1AY4106389598
GCH1AY41063910090600225
GCH1NM_0001619606GCH    DYT5    GTPCH1    600225
gch1BX572603258594
GCH1NT_0264379606600225
gch1NC_005296258594

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

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Text2Knowledge ... Yong Huang 2002