Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
GTPCH1BC0254159606DYT5    GCH    GCH1   
GTPCH1NM_0001619606GCH    DYT5    GCH1   

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

Google

Text2Knowledge ... Yong Huang 2002