File:CD4+Thelpercells.jpg

Summary
T cell subsets of CD4+ T helper cells. Th cells are differentiated from naïve CD4+ T cells into 4 major lineages: Th1, Th2, Th17, and T-regulatory (Treg) cells. Each Th subset exhibits characteristic functions, patterns of cytokine secretion, and expression of specific chemokine receptors.

source: Human T-Lymphotropic Virus Type 1 (HTLV-1) and Regulatory T Cells in HTLV-1-Associated Neuroinflammatory Disease Araya et al (2011) doi: 10.3390/v3091532 https://www.researchgate.net/publication/51712125_Human_T-Lymphotropic_Virus_Type_1_HTLV-1_and_Regulatory_T_Cells_in_HTLV-1-Associated_Neuroinflammatory_Disease/download