How does gene regulation in eukaryotes occur? How many levels are there?

There are 4 levels to gene regulation in eukaryotes: Transcriptional -> Controls whether or not a gene is transcribed from DNA to mRNA) Post-Transcriptional -> Changes that occur to the mRNA molecule after transcription -> ex. Introns removed and exon's spliced together Translational -> Controls how fast and often mRNA molecules are translated Post-Translational -> Affects rate at which a protein becomes "active" and how long it remains functional