National Geographic explores the science behind bones, blood, muscles, and skin.
People with genetic bone disorders are profiled, including a 9-year-old with brittle bone disease, and a 28-year-old with fibrodysplasia ossificans progressiva (FOP), which turns muscles into bone.
Cameras follow a 12-year-old with a bulging vascular malformation caused by abnormal blood vessels as he undergoes a risky procedure to have it diminished. Also: a 16-year-old with Klippel-Trenaunay (KT) syndrome is profiled.
Profiling a 31-year-old with dystonia, a rare movement disorder that causes involuntary contractions of muscles. Also followed: a 41-year-old man with spinal muscle atrophy, which has caused his muscles to wither away.
Two rare skin disorders are examined, including harlequin ichthyosis (HI), a condition characterized by hard, scale-like skin that reproduces at an accelerated rate; and epidermolysis bullosa (EB), which causes the skin to be very fragile.