Your Query returns 10 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
GCHBC0254159606DYT5    GTPCH1    GCH1   
GCHNM_0001619606DYT5    GTPCH1    GCH1   
gchAJ3118467955
gchAF0520486317
gchAY128670204891
GchNM_00810210090GTPCH    GTP-CH   
GchNW_04745210116
GchNM_02435610116
GchNT_03959910090
GchBC00564310090GTPCH    GTP-CH   

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

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Text2Knowledge ... Yong Huang 2002