Regeneration

This explains Rhinos, Gorillas, Bulls, Elephants …….all vegetarians but huge muscles.

https://www.t-nation.com/diet-fat-loss/tip-two-vegetables-that-grow-muscle

Follistatin inhibits Myostatin also.
Follistatin is being studied for its role in regulation of muscle growth in mice, as an antagonist to myostatin (also known as GDF-8, a TGF superfamily member) which inhibits excessive muscle growth. Lee & McPherron demonstrated that inhibition of GDF-8, either by genetic elimination (knockout mice) or by increasing the amount of follistatin, resulted in greatly increased muscle mass.[7][8] In 2009, research with macaque monkeys demonstrated that regulating follistatin via gene therapy also resulted in muscle growth and increases in strength. This research paves the way for human clinical trials, which are hoped to begin in the summer of 2010 on Inclusion body myositis.[9]
A study has also shown that increased levels of follistatin, by leading to increased muscle mass of certain core muscular groups, can increase life expectancy in cases of spinal muscular atrophy (SMA) in animal models.[10]

http://roguehealthandfitness.com/inhibit-myostatin-muscle-growth/?fbclid=IwAR2kCGPrDQ9fBqTPf-KxYPxFKXC5QpGp02htXgklLWMb3yMJeCzmFbZZBVY
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