In an adult who is anemic or has been exposed to radiation or toxic chemicals,yellow bone marrow can become red bone marrow again.

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Yellow bone marrow can be converted back into red bone marrow in certain conditions such as anemia or exposure to radiation or toxic chemicals. This process is known as "myeloid metaplasia" or "myelophthisic" transformation. In this process, the yellow adipocytes are replaced by developing red blood cell precursors in the bone marrow.

In an Adult Who Is Anemic or Has Been Exposed