"Thinning hair" is a common concern for men. Hair is formed from the collection of old cells that are pushed after cell division. Thinning hair occurs when cell division stops due to movement of an enzyme in male hormone, causing the hair to cease growing and fall out. Now, a radical new treatment for thinning hair using cell technology is opening up led by iPS cells. Researchers at the RIKEN Center for Developmental Biology used regeneration therapy to create the hair follicle, the organ which produces hair, and succeeded in growing hair on a mouse. We'll look at the front lines of hair regenerative therapy that could be connected to the regeneration of various other organs as well.