Your Query returns 8 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Il-9NM_00837310090Il9   
IL-9NM_0005909606P40    HP40    IL9   
IL-9BC0662849606HP40    P40    IL9   
IL-9BC0662879606HP40    P40    IL9   
IL-9BC0662839606HP40    P40    IL9   
IL-9BC0662859606HP40    P40    IL9   
IL-9BC0662869606HP40    P40    IL9   
IL-9AC0024289606

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

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Text2Knowledge ... Yong Huang 2002