This is the third time I've proposed a change to this card, as it's objectively incorrect. At the very least I'm hoping that someone will give me a more thoughtful response. A simple internet search of "what cells secrete IL-2" will show you that all T-cells secrete IL-2 - it's an autocrine thing.
Even easier, the FirstAid table *in this card* lists IL-2 under the heading of "All T-Cells" - making the initial response I got the first time I suggested changing this card ("Table states only Th1 secretes IL-2 and FA table does not mention what secretes IL-2, only its actions") also objectively incorrect. Whoever sent that response doesn't seem to have read the headings of the FA table that, again, is literally organized by what secretes a given cytokine.
StatPearls, FirstAid, ScienceDirect, R&D Systems, and more all support that IL-2 is secreted by all T-cells, and even some others including dendritic cells and NK cells. Try https://jlb.onlinelibrary.wiley.com/doi/pdfdirect/10.1002/JLB.2RI0717-278R
| Cell | Induced by | Inhibited by | Secretes |
|---|---|---|---|
| Th1 | IFN-γ, IL-12 | IL-4, IL-10 | IFN-γ, IL-2 |
| Th2 | IL-2, -4 | IFN-γ | IL-4, -5, -6, -10, -13 |
| Th17 | IL-1, -6, TGF-β | IFN-γ, IL-4 | IL-17, -21, and -22 |
| Treg | TGF-β, IL-2 | IL-6 | TGF-β, IL-10, -35 |



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