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Table 1 P-call definition

From: The IronChip evaluation package: a package of perl modules for robust analysis of custom microarrays

Feature P-call Conditions
P The signal intensity is higher than the background cut-off value in both channels
M The signal intensity is higher than the background cut off value in one channel and lower in the other channel
A The signal intensity is lower than the background cut off in both channels
  1. Definition of a P-call flag (at the feature level) to distinguish bona fide signals from background noise