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Table 2 Count summary of probes before and after 50–50 split-retest procedure. Hypervariable and Hypovariable probes that were not retained after the split-retest were relabeled as “Non-Variable”

From: Human gene expression variability and its dependence on methylation and aging

Probe Set

Tissue

Number of Probes Before Retesting

Number of Probes After Retesting

% of Probes After Retesting

Hypervariable

Breast

3125

1448

46.34

Cerebellum

2987

1640

54.90

Frontal Cortex

2949

1760

59.68

Hypovariable

Breast

4371

957

21.89

Cerebellum

2619

837

31.96

Frontal Cortex

3019

1254

41.54

Non-Variable

Breast

34,456

39,547

114.78

Cerebellum

36,356

39,485

108.61

Frontal Cortex

35,994

38,948

108.21