Why is it that you don't enjoy to use anti-rejection drugs for bone marrow, bone and ligament transplants?

I have a nearest and dearest member who have had an organ transplant, so I know give or take a few anti-rejection for organs, but I am curious to know why it is that anti-rejection drugs are not required for ligaments, bones and bone marrow. Thank you for your time!

Answers:
Bone marrow is the tissue that produces the very immune system cell that attack transplanted organs. Since bone marrow is a transplant, it will not attack itself, since it recognizes its own cell. Therefore, bone marrow is not rejected. Sometimes, however, the immune system cells that transplanted bone marrow produces may not endorse host tissues (since they "look" foreign to them) and may start attacking them. In a sense, the transplant "rejects" the host. This phenomenon is called graft-versus-host disease.

For bone and liganment transplants at hand are not enough live cell in them for the body to reject. Basiscally they are processed so adjectives of the original cell are dead and the transplants are in recent times a scaffolding so that the new host can replace the old-fashioned tissue with latest tissue over the course of months to years

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Why is it that you don't enjoy to use anti-rejection drugs for bone marrow, bone and ligament transplants?

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