... 8 kinds of essential amino acids that the human body can not synthesize), unsaturated fatty acids, vitamins, zinc, manganese, iron, calcium, ... has slight change, so it is the only delicacy that can not be planted in order in the world. Sometimes the truffle ... oak, hazel, beech and lime tree, because truffle can not carry out photosynthesis, can not survival independent and has to rely on the symbiotic ...