The JAK/STAT pathway. (IMAGE) First Hospital of Jilin University Caption Distinct intracellular signalling pathways are mediated by the JAK family of tyrosine kinases. The JAK-STAT pathways use second messengers to convey extracellular information to the nucleus to affect target gene expression and cellular responses. Image created through the use of www.biorender.com. GM-CSF, granulocyte-macrophage colony-stimulating factor; IFN, interferon; IL, interleukin, JAK, Janus kinase; STAT, signal transducer and activator of transcription; TYK, tyrosine kinase. Credit By Dr Aditi Kumar and Dr Philip J Smith Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. License CC BY-NC Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.