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. 2019 Jan 16;14(1):e0210839. doi: 10.1371/journal.pone.0210839

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© 2019 Pellegrino et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 2 — Graphs show the percentages of CD8⁺ Tregs expressing PD-1 (a), PD-1^high (b), PD-1^low (c), and the percentages of CD8⁺ Teffs expressing PD-1 (d), PD-1^high (e) and PD-1^low (f). For the investigation present in figure, 20 HD, 9 ND and 10 LT samples were studied.