Your Query returns 8 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Adamts20NM_17743110090bt    Adamst20    ADAMST-20    ADAMTS-20   
ADAMTS20AF4888049606
ADAMTS20NM_0250039606
Adamts20NT_03962110090
Adamts20AY18981510090
Adamts20AY18981610090
ADAMTS20NM_1758519606
ADAMTS20NT_0294199606

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

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Text2Knowledge ... Yong Huang 2002