some CNV segments in 21Q2 CCLE_segment_cn.csv contains in amplification status column an U instead of expected +,0,-.
Download (direct from figshare):
Source: Broad Institute
Segment level copy number data - DepMap_ID - Chromosome - Start (bp start of the segment) - End (bp end of the segment) - Num_Probes (the number of targeting probes that make up this segment) - Segment_Mean (relative copy ratio for that segment) - amplification status (+,-,0)"
Is this a bug? If not what U stands for?