Fig. 6

The mean expression of genes with a fixed intronic L1 that is expressed is higher than those genes with a fixed intronic L1 that is not expressed. a–d The mean expression of genes with a fixed (not polymorphic) intronic L1 was quantified from the RNA-sequencing data across the four tissues analysed for the L1 expression (motor cortex, frontal cortex, cerebellum and cervical spinal cord). The mean expression of those genes containing an expressed L1 was significantly higher than those containing a L1 that is not expressed. Wilcoxon test, *p < 0.05, **p < 0.01 and ***p < 0.001