LIN28B is a highly conserved RNA-binding protein that regulates key cellular processes such as stem cell maintenance, development, metabolism, and oncogenesis. A member of the LIN28 family alongside LIN28A, it modulates gene expression at the post-transcriptional level by binding specific mRNA targets. LIN28B primarily functions as a translational repressor, blocking ribosome recruitment, and can also influence mRNA stability and processing through interactions with other RNA-binding proteins and microRNAs (miRNAs).