Distribution of MAS5 log
(signals) before and after filtering. A) No filter. B) Filtering with threshold of ≥ 50% Present in at least one treatment group. C) Filtering by average signal with threshold at ≥475 in at least one treatment group. The number of probe-sets at each value of Log2(signal) are plotted. Black = Present, gray = Marginal, white = Absent.