Splicing can happen either during transcription, or directly afterwards.
I am reading about single-cell RNA seq, and according to this paper, they observed that 15–25% of reads contained unspliced intronic sequences.
Now assuming that the majority of reads from RNA seq will come from RNA that has finished being transcribed...
Does this suggest that 75-85% of all genes are spliced during transcription? In other words, are 80% of our genes fully mature (spliced) immediately following transcription?