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. 2020 Feb 25;9(3):531. doi: 10.3390/cells9030531

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Markers of memory T cell subsets and their precursors: Terminally differentiated T_CM (blue) and T_EM (red) can be distinguished based on the expression of CD62L, CCR7, IL7R, and other markers not shown. T_RM can be further characterized based on the expression of KLF2, IL-15R, CD103, and S1PR1. T_CM can give rise to T_EM and vice versa. *Recent data suggested that T_RM can re-enter the circulation.