Th3 cell

https://doi.org/10.1351/goldbook.13720
Helper T lymphocyte (Th) producing and responding to transforming growth factor $\ce{\upbeta\!}$ ($\ce{TGF\mbox{-}\upbeta\!}$) and helping immunoglobulin A (IgA) antibody responses.
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1251 [Terms] [Paper]