{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nA review of the provided literature reveals an extensive characterization of cytokine‐dependent immune regulation—with IL‑21 emerging as a central autocrine and paracrine mediator driving T helper cell differentiation (including Th17, Tfh, Th1 and Th2 subsets), regulating germinal center formation, promoting B cell responses, and even influencing cytotoxic T lymphocyte and natural killer cell functions."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "36"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nNotably, despite the wealth of data on IL‑21 and its associated signaling networks governing adaptive immunity, none of the studies provided here address or mention LINC01520. In other words, while IL‑21 is shown to orchestrate a broad array of functions—including the modulation of T cell lineage commitment, B cell maturation, effector function, and even the regulation of autoimmune and antitumor responses"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "16"}, {"type": "fg_f", "ref": "23"}, {"type": "fg_f", "ref": "31"}, {"type": "fg_f", "ref": "7"}, {"type": "fg_f", "ref": "29"}, {"type": "fg_f", "ref": "24"}, {"type": "fg_f", "ref": "33"}]}, {"type": "t", "text": ", the function of the long noncoding RNA LINC01520 remains unexplored in these reports. Its potential involvement in the transcriptional orchestration of these cytokine signals or in modulating immune cell differentiation and effector actions is therefore still an open question and a promising target for future research.\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Marion T Kasaian, Matthew J Whitters, Laura L Carter, et al. 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