presented a study on the impact effects of different drying methods on the structure of dehydrated button mushroom slices presented by scanning electron micrographs. Scientists claim that the micrographs of the samples that were air-dried appeared to have severe shrinkage, whereas freeze-dried products were relatively large, with the internal pore structures. Such a pore structure can facilitate the penetration of UVB radiation, and causes a higher level of conversion of ergosterol in the freeze-dried fruit bodies.