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. 2012 Jul 25;7(7):e41361. doi: 10.1371/journal.pone.0041361

Table 2. Differentially methylated probes for each cell population in comparison to whole blood.

M-value comparison Comparison on calls* Absolute variation in comparison to whole blood (M-values)** Unmethylated Marginal Methylated
PBMC 23226 5693 1.2–11.1 1.7% 25.8% 72.5%
CD4+ T-cells 58980 18537 1.2–51.9 9.4% 34.5% 56.1%
CD8+ T-cells 125713 32948 1.2–93.2 6.8% 59.7% 33.4%
CD56+ NK cells 92238 23484 1.1–54.0 6.5% 58.4% 35.1%
CD19+ B cells 97377 23245 1.2–221.8 15.0% 55.7% 29.3%
CD14+ Monocytes 41063 12625 1.2–70.4 71.2% 13.2% 15.6%
Granulocytes 27365 8815 1.2–13.1 85.3% 9.5% 5.2%
Neutrophils 28581 10808 1.2–14.5 84.2% 10.1% 5.7%
Eosinophils 52431 17723 1.2–117.2 65.8% 23.3% 10.8%

PBMC-Peripheral blood mononuclear cells. Differentially methylated probes were defined by a linear model using the M-values. M-value is the log2 ratio of the intensities of methylated probe versus unmethylated probe, a measurement of how much more a probe is methylated compared to unmethylated [46]. *To extract the probes with largest difference in methylation, a gamma fit model was applied to M-values in order to define the three calls: “unmethylated”, “marginal” and “methylated”. Significant probes sharing the same call in the two compared populations were removed. **Variation is based on the estimate of the log2-fold-change corresponding to the effect obtained from the linear model, absolute M-values are presented. The percentages are based on the call distribution.