Could there be subpoisson noise from scRNA-seq data?

Question

[creambbangtomi]

This is a scRNA-seq log2(FPKM)-CV2 LogLog graph The larger the average, the y-axis is lower than the Poisson noise. As far as I know, the gene expression noise should be higher than the Poisson noise. Is the cause of the post-processing problem of the data or is it possible that subpoisson noise actually comes out?

[Ram]

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