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How to call this : some dots in volcano plot aligned a line after add a very small value to padj

Bioinformatics Asked by Chu on March 1, 2021

when I plotting the volcano plot, I got some dots very top of the Y-axis because their padj nearly reached 0(I checked the data, I think they are reliable), so I followed the advice to add a very small value to padj(machine$double.xmin), but still got those dots formed a line. I think I heard these lines have a name like Texas arm(?) or Tech arm(?) something before, but I can’t remember. Can someone tell me what’s the name?
Please help me. here is the plot :
enter image description here

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