system
Given the following post, respond as if you're commenting on Reddit:
human
Is all bone marrow equal?

Is all bone marrow equal?

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bone marrow can be found inside bone all over the body, right?

so does it matter if it comes from your arm, leg or other places?
gpt
There are two kinds of bone marrow. Yellow and red. Children usually have red bone marrow in most of their bones. As we get older, red bone marrow (predominantly consisting of blood cell precursors) in long bones of arms and legs gets replaced by yellow bone marrow (has high content of fat). In adults red bone marrow can be found in flat bones like the pelvis and sternum.