What is the biological basis of pattern formation of skin lesions? by Chuong, C, Dhouailly, D, Gilmore, S, Forest, L, Shelly, W, Stenn, K, Maini, P, Michon, F, Parimoo, S, Cadau, S, Demongeot, J, Zheng, Y, Paus, R, Happle, R