This function is to determine each gene's testability. A gene is testable if at least one of its exons are testable.
a ReadCountSet object after exon testability checked, usually the output of
This result can applied to filter out genes not expressed.
A logical vector indicating which genes are testable, i.e., having at least one exon testable.
exonTestability before run this function.
Xi Wang, email@example.com
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