generate questions: 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.
The structure of immune system components can be described as what? {sep_token} Are immune tissues typically fixed with specific organs usually? {sep_token} What is one way the cellular structures of the immune system are housed in the body? {sep_token} What is another way these tissues are housed within the body? {sep_token}