Parkinson’s disease is usually common with old people. As people grow old secretion of dopamine decreases. I think as activities that demands less secretion of the hormone decreases , there are tendencies of one having the disease. Also, the use of animal in experimental research requires following ethics. Animals have their rights too. This is a post.
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Thank you, @steepup. That's a great contribution u've added. I love it. Thank you for coming around and also for acknowledging my post.