Figure 1.

Flow cytometry scatter plots showing CD4⁺ and CD8⁺ T cells isolated from male subjects aged 18.8 ± 1.7 years from a military base in Shijiazhuang City, Hebei Province, China, prior to and following a 3-month basic training programme. (A) Number of CD4⁺ cells before military training commenced; (B) Number of CD4⁺ cells following military training; (C) Number of CD8⁺ cells before military training commenced; (D) Number of CD8⁺ cells following military training. CD4-FITC, CD4⁺ fluorescein isothiocyanate-stained cells; CD8-PE, CD8⁺ phycoerythrin-stained cells; CD3-PC5, CD3⁺ phycoerythrin-Cy5-stained cells; M1–4 and J1–4 represent arbitrary labelling of the four quadrants for analysis.