# 21Q2 CCLE\_segment\_cn.csv contains U instead of +,0,-

**URL:** <https://forum.depmap.org/t/21q2-ccle-segment-cn-csv-contains-u-instead-of-0/629>\
**Category:** Issues and Bugs\
**Created:** [May 27, 2021, 7:43am UTC](https://forum.depmap.org/t/21q2-ccle-segment-cn-csv-contains-u-instead-of-0/629 "2021-05-27T07:43:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dan3](https://avatars.discourse-cdn.com/v4/letter/d/b9bd4f/32.png) [@dan3](https://forum.depmap.org/u/dan3)\
**Post date:** [May 27, 2021, 7:43am UTC](https://forum.depmap.org/t/21q2-ccle-segment-cn-csv-contains-u-instead-of-0/629/1 "2021-05-27T07:43:28Z")

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Hello,

some CNV segments in 21Q2 CCLE\_segment\_cn.csv contains in amplification status column an U instead of expected +,0,-.

## Quote:

CCLE\_segment\_cn.csv  
Download (direct from figshare):  
Source: **Broad Institute**

## File Description

## 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?

Best Regards,  
Dan

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**Author:** ![jnoorbak](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.depmap.org/jnoorbak/32/12_2.png) [@jnoorbak](https://forum.depmap.org/u/jnoorbak)\
**Post date:** [June 1, 2021, 7:21pm UTC](https://forum.depmap.org/t/21q2-ccle-segment-cn-csv-contains-u-instead-of-0/629/2 "2021-06-01T19:21:43Z")

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Hi Dan, the ‘U’ means that the amplification status is unknown to us. You can read a bit more about this [here](https://forum.depmap.org/t/u-values-in-the-status-column-in-seg-files/533). Let me know if that helps. -thanks