When immunology was a new science the immune system and immune response were viewed in rather simple terms. The immune system was viewed to be rather autonomous in function and to be a primairly internally regulated system. This view was supported by the fact that various elements of the immune system are capable of functioning in in vitro systems and by the natural antibody selection theory (1). As our knowledge of immunity and the immune system has increased it has become increasingly clear that the immune system is quite complex, both in its make up and its functions.
KeywordsImmune System Immune Function Vasoactive Intestinal Peptide Opioid Peptide Endogenous Opioid
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