Figure 2From: Accuracy and differential bias in copy number measurement of CCL3L1 in association studies with three auto-immune disordersA cumulative frequency plot of unrounded copy number values measured by the three PRT systems, (CCL3C, CCL4A and LTR61A) among samples assigned a copy number of 2 for the random UK control samples (149 samples). All three systems show a similar distribution around the mean value, displaying no obvious heterogeneity between the systems.Back to article page