Sorry, I ran out of credit http://boobs.pet/ boobs gif The eureka moment came when Jahoda realized that the spontaneous clumping of rodent papilla cells might be the key, and that the human version — which doesn't cluster — might have to be cultured in a different way. So the team grew the human cells in drops suspended upside-down off the lid of a lab dish. Gravity drew the papilla cells to the bottom of the drop and, clumped together like that, the cells developed in a way that made them able to reprogram the skin grafts to grow new hair.