Gen toolkit runtu papinedding mari laleng rupa de' na sippada, pappada papitto dongi kutilang-maloppo Darwin di paloppoi sibawa gen BMP, iyarega  ular degaga ajena nasaba gen Distal-less (Dlx ) mancaji kurang-peneddingi iyarega de' na nipeneddingi mappada maneng ri onrong tega reptil lainge ya tuttu bata' kale  yaro.