Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
cox1-i2AJ3074104952cox1    cox1-i3    cox1-i4    cox1-i7    cox1-i9    cox1-i5   
cox1-i2NC_0026594952cox1-i4    cox1-i9    cox1    cox1-i7    cox1-i3    cox1-i5   
cox1-i2AJ3074104952
cox1-i2AJ3074104952cox1    cox1-i3    cox1-i4    cox1-i5    cox1-i7    cox1-i9   
cox1-i2NC_0026594952cox1-i4    cox1    cox1-i9    cox1-i5    cox1-i3    cox1-i7   

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

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Text2Knowledge ... Yong Huang 2002