why there are negative value in the CPTAC proteomics expression level?
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zihaoxingstudy1 commented
why there are negative value in the CPTAC proteomics expression level?
samuelpayne commented
The data is normalized and centered to zero. Zero is the average expression value. positive is above average, negative is below average. It is discussed at greater length in the publications. (PMIDs are in the dataset info, see tutorial 1)