Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
2900009G18RikNM_01878810090Ext1l    Extl3   
2900009G18RikBC06507310090Ext1l    Extl3   

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

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Text2Knowledge ... Yong Huang 2002