Answer
Post-transcriptional gene regulation involves microRNAs (miRNAs), which are small non-coding RNA molecules. miRNAs play a crucial role in regulating gene expression by binding to the 3' untranslated region (UTR) of target mRNAs. This binding can either inhibit translation or promote mRNA degradation, effectively silencing gene expression. miRNAs are essential for various cellular processes, including development, differentiation, and metabolism.