Zhao Zhao Y Y Kilian Kilian C C Turner Turner JE JE Clonal expansion and activation of tissue-resident memory-like Th17 cells expressing GM-CSF in the lungs of severe COVID-19 Clonal expansion and activation of tissue-resident memory-like Th17 cells expressing GM-CSF in the lungs of severe COVID-19 patients. This evidence concerns the gene CSF2 and COVID-19.