|A bodys immune system is present to protect its body cells from foreign substances that cause diseases. It produces antibodies against the foreign antigens leading to their destruction and hence death. In addition to this, various immune cells like lymphocytes and monocytes disrupt foreign cells by the process of phagocytosis in a normal biological condition.
Review article comes in the form of systematic reviews and literature reviews and are a form of secondary literature. Systematic reviews determine an objective list of criteria, and find all previously published original research papers that meet the criteria. They then compare the results presented in these papers. Literature reviews, by contrast, provide a summary of what the authors believe are the best and most relevant prior publications.
The concept of "review article" is separate from the concept of peer-reviewed literature. It is possible for a review to be peer-reviewed, and it is possible for a review to be non-peer-reviewed.