The difference between FT825 and FT836 (notice the latter has no IL-7R fusion). Hard to say why they don't disclose, but it could be due to either IP protection, incremental advantage, they don't want scrutinised yet, and/or [marketing] optics. I know some old patent shows they have been working on engineering iTs with constitutively expressed TCF7 and/or CD27, as well as TRAC regulated soluble IL-2.
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