Amphibia 2 Amphibians 2 Animals 2 Brain-Derived Neurotrophic Factor 2 Cell Proliferation 2 Embryo, Nonmammalian 2 Larva 2 Models, Animal 2 Models, Biological 2 Nerve Regeneration 2 Neurons 2 Neurotrophins 2 Olfactory Mucosa 2 Olfactory Nerve 2 Olfactory neuron 2 Random Allocation 2 Regeneration 2 Rhinella arenarum (bufo arenarum) (anura) 2 Zinc Sulfate 2 animal 2 animal embryo 2 animal model 2 article 2 biological model 2 brain derived neurotrophic factor 2 cell proliferation 2 drug effect 2 evaluation 2 growth, development and aging 2 injury 2