Your Query returns 19 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
STAT5BC0208689606STAT5B   
STAT5BC0270369606MGF    STAT5A   
STAT5NM_0031529606MGF    STAT5A   
STAT5NM_0124489606STAT5B   
STAT5NM_01148810090Stat5a   
STAT5AF39416647145
stat5AH0128327955
stat5AY2890037955
stat5AY2890047955
stat5AY2890057955
stat5AY2890067955
stat5AY2890077955
STAT5L411429606
STAT5AF2275629544
Stat5AF1445659031
Stat5AF0742489031
Stat5AF2158679031
STAT5AF1474998022
STAT5NM_2047799031

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

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Text2Knowledge ... Yong Huang 2002