Context: Many components of the immune system are typically cellular in nature and not associated with any specific organ; but rather are embedded or circulating in various tissues located throughout the body.

Question: The structure of immune system components can be described as what?
Answer: typically cellular in nature

Question: Are immune tissues typically fixed with specific organs usually?
Answer: not associated with any specific organ

Question: What is one way the cellular structures of the immune system are housed in the body?
Answer: embedded

Question: What is another way these tissues are housed within the body?
Answer: circulating