In addition, the authors identified CCR6+ Tfh cells and revealed the importance of the CCR6-CCL20 axis in the migration of CCR6+ Tfh cells to the liver.219 Kimura et al220,221 found that the level of CCR7− Tfh cells was elevated in PBMCs of AIH patients with low levels of IgG, which may be helpful for early diagnosis of AIH. The gene discussed is CCL20; the disease is autoimmune hepatitis.