Multicentre Harmonisation of a Six-Colour Flow Cytometry Panel for Naïve/Memory T Cell Immunomonitoring

Figure 6

Multivariate analysis by PCA. Biplots displaying both operators’ readings (points) and parameters (vectors). Confidence ellipses are provided () for operators’ readings after grouping them according to “Centre” (a, d), specific “Instrument” (b, e), and “Instrument model” (c, f) to analyse the impact of such factors on major (a–c) and naïve/memory (d–f) lymphocyte subsets. Ellipses can be drawn when at least 3 readings are available in groups. Results from one representative WB donor are shown.