Your Query returns 35 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Stat5aAF1351229823
STAT5AAF0795689913
stat5AAJ2379379913
stat5AAJ2425229913
STAT5aU966449913
STAT5aAF2509119913
STAT5AAY2803689902
STAT5AAY2803699913
Stat5aNW_04733910116
STAT5ABC0270369606MGF    STAT5   
STAT5AAJ4128779606
STAT5AAJ4128789606
STAT5AAJ4128799606
STAT5AAJ4128809606
STAT5AAJ4128819606
STAT5AAJ4128829606
STAT5AAJ4128839606
STAT5AAJ4128849606
STAT5AAJ4128859606
STAT5AAJ4128869606
STAT5ANM_0031529606MGF    STAT5   
Stat5aU3650210090
Stat5aU2110310090
Stat5aAF04910410090
STAT5AAJ23793810090
Stat5aNT_03952110090
Stat5aAF24697810090
Stat5aBC05664710090
Stat5AAY29949110090
Stat5AAY29949210090
Stat5aBC00899810090
Stat5aBC01327410090
Stat5aNM_01706410116
STAT5ANT_0107559606
Stat5aNM_01148810090STAT5   

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

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Text2Knowledge ... Yong Huang 2002