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.
একটা উপায় কী, যেটার মাধ্যমে রোগপ্রতিরোধ ব্যবস্থার কোষীয় গঠনগুলো শরীরে থাকে?
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