Olympics doping

Saw the one with the two rats

Remember gene expression is just like a car's accelerator and brake. Some gene products accelerate and others inhibit. Genes that control life<-->death. Genes that promote growth and genes that inhibit growth. Oncogenes whose activity produces cancer and tumor suppressor oncogenes whose absence promotes cancer. Take that foot off the brake and voila, more muscle growth.

Actually same goes with nervous system. There are stimulatory and inhibitory nerves to muscles.
 
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