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It is found in the skeletal muscle of mammals.
your born with it
"MY-OH-STAT-IN"
When you see your baby abs showing a little at that age and muscle on the back and arms. You will see that they have myostatin. When you don't see any. When they are one years old let them do one chin up and when they can they are myostatin.
Myostatin is the protein that is secreted to initiate growth. It effects the muscles because it inhibits muscle differentiation and growth.
Myostatin is a protein that is in the human body. It is specially encoded by the MSTN gene and is usually in the skeletal muscle cells to inhibit muscle growth and differentiation.
Myostatin is a protein which is found in certain persons. It is made in the cells of muscles, and is carried through ones blood stream where it attaches itself to other muscles. From there, it inhibits their growth.
My human physiology is a bit rusty but if I remember correctly hormone supplementation can inhibit the body's ability to produce that hormone on its own. So my question is this: could supplementation with myostatin (GDF8) effect (read: lower or shut down) the body's ability to produce the hormone on it's own?
Yes, but in mammals it is a minor function. (In salt water fish it is their major function.)
The placenta is for nourishing the embryo.
While at first glance birds seem similar to mammals, they are more closely related to reptiles.
If you have a genetic defect in myostatin: http://en.wikipedia.org/wiki/Myostatin ha! if it is not the condition above, then im certain that it is not actually possible unless you have a disorder or peculiar growth spurt. good luck, if you do find out, please tell me