TIGIT and sarcoidosis: CXCR5− PD‐1hi cells retain transcriptional signatures reminiscent of Tfh cells17, 18, 19 but PD‐1hi CXCR5− CD4+ T cells were not expanded in active sarcoidosis, and very few PBMCs from active TU patients expressed a Tph transcriptional signature (TOX, MAF, TIGIT, CD40LG).