Your Query returns 15 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Extl3NM_01878810090Ext1l    2900009G18Rik    605744
Extl3NW_04745410116
Extl3NM_02009710116Regr   
EXTL3BC0063639606EXTR1    KIAA0519    REG    RPR    605744
EXTL3U761889606605744
EXTL3AF0016909606605744
EXTL3AF0835519606EXTR1    EXTL1L    605744
EXTL3AY3994209606605744
EXTL3AY3994219598
EXTL3AY39942210090605744
Extl3XM_13084310090Ext1l    Extl1    605744
Extl3NT_03960610090605744
Extl3BC06507310090Ext1l    2900009G18Rik    605744
EXTL3NM_0014409606REG    RPR    EXTR1    KIAA0519    605744
EXTL3NT_0236669606605744

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

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Text2Knowledge ... Yong Huang 2002