DABG is statistical algorithm that assumes that each probe in the probe set is used. If each probe is not used, the statistics are skewed or biased to create a false negative situation. A transcript-level probe set on a WT array consists of all possible exon probe sets for that isoform and some may not be used due to alternative splicing. For this reason, it is always appropriate to determine if an exon is detectable. It is not always appropriate to assume all exon probe sets at the transcript level are detectable.
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