STAT5A -STAT5A homodimers and STAT5A -STAT5B heterodimers formed in response to GM-CSF .
stat5a -stat5a homodimers and stat5a -stat5b heterodimers formed in response to gm-csf .
B-protein_molecule B-protein_molecule O O B-protein_molecule B-protein_molecule O O O O O B-protein_molecule O