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Negative score in TCGA pancancer gene expression data

Dear all,

I am working with TCGA pancancer gene expression level 3 data. I found that there are some genes expression levels are negative. Could anyone please tell me how the negative score generated?

rnaseq gene-expression

​Are they logged?

Log10( 0.1) = -1

They are logged by Log2(x+1), which should not be negative...

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