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Artifacts points in MD plots?

Can someone explain the possible origin of the circled seemingly artifacts points in the MD plot shown below?

Thanks!

https://ibb.co/HHBLhR6

https://i.ibb.co/VqJ0wbR/MDplot-Artifacts.png

rna-seq

those points are related to the log transformation when you have 0 or close to 0 values

1 answer

https://ibb.co/HHBLhR6

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