{"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"LIN28 homolog A is a protein that in humans is encoded by the LIN28 gene. LIN28 is thought to regulate the self-renewal of stem cells, is highly expressed in human embryonic stem cells and can enhance the efficiency of the formation of induced pluripotent stem cells from human fibroblasts. LIN28 is expressed in testicular intratubular germ cell neoplasias, classic seminomas, embryonal carcinomas, and yolk sac tumors."}]}]}