Your Query returns 25 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Extl1XM_13084310090Ext1l    Extl3    601738
Extl1NM_01957810090D430033M16Rik    601738
EXTL1BC0655289606EXTL    601738
EXTL1AH0072069606601738
EXTL1AF0836239606601738
EXTL1AF0836249606601738
EXTL1AF0836259606601738
EXTL1AF0836269606601738
EXTL1AF0836279606601738
EXTL1AF0836289606601738
EXTL1AF0836299606601738
EXTL1AF0836309606601738
EXTL1AF0836319606601738
EXTL1AF0836329606601738
EXTL1AF0836339606601738
EXTL1AH0093989606601738
EXTL1AF1513919606601738
EXTL1AF1539809606601738
EXTL1AY4108239606601738
EXTL1AY4108249598
EXTL1AY41082510090601738
EXTL1NM_0044559606EXTL    601738
Extl1NT_03926710090601738
Extl1AF22446110090601738
EXTL1NT_0374859606601738

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

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Text2Knowledge ... Yong Huang 2002