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. 2020 Apr 26;21(9):3052. doi: 10.3390/ijms21093052

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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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Relatively low expressions of CD8 T cells were identified at the injection sites in all three groups. Very few CD8 T cells (indicated as solid red arrows) were identified at the injection site, including the MEM-injected group. Compared to the xenogeneic (xeno) group, the highest number of CD8 T cells was observed in the allogeneic (allo) while the lowest number was observed in the syngeneic (syn) group. Red solid frames indicated magnified area of CD8 T cells. Statistical significance was defined as *** p < 0.001 vs. xenogeneic (xeno); mean ± S.E.M. Scale bars = 50 µm.