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hence, up-regulating of existing protective mechanisms is a possible way to achieve this
Tyrosine hydroxylase is the critical enzyme in the synthesis of epinephrine, norepinephrine and dopamine, and tryptophan hydroxylase is the essential enzyme in the synthesis of serotonin
furthermore, modern sera from children were more effective at neutralizing contemporary virus, thus demonstrating the difficulty of designing a vaccine against a moving target [80]
Liver biopsies often dont help, as symptoms are similar to other liver conditions
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