The JAK kinases and the signal transducers and activators of transcription ( STAT ) factors have been found to be essential components .
the jak kinases and the signal transducers and activators of transcription ( stat ) factors have been found to be essential components .
O B-protein_family_or_group I-protein_family_or_group O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O O O O O O O O