Rucksack 2K14 posted:

Michael Berryman was featured in a PBS series called "Your Inner Fish," where they explored parts of human anatomy as they've evolved from sea creatures. It's fascinating, and Berryman appeared in a segment on how everything from skin to teeth to organs relies on folding instructions from a specific gene, and the lack of those instructions led to his ectodermal dysplasia — he was born with no hair, no teeth, no nails, missing large bits of flesh, no sweat glands, and some other things.

Some people with ectodermal dysplasia develop cone- or peg-shaped teeth.