the immune and nervous systems communicate with one another through neuropeptides. one of the most amazing linksbem and our thoughts and feelings have to do with neuropeptides. these are tiny little proteins, just a couple of amino acids long, that have been discovered over the last 1o years. endorphins, for example, are neuropeptides, those painkillers that our own brain produces. now about 6o of these have been identified. the major site in the brain where they're produced is the limbic system. the limbic system is the seat of our etions. we experience joy, anger, sorrow, confidence-- all of these feelings-- love, through the limbic system. it turns out that each one of these emotions has a different chemical fingerprint. we experience them, we release these various peptides down into the bloodstream, and they bind to various cells within our body, including the cells of our immune system. now that we know that the immune system is affected by neuropeptides and we understand that psychological stress can have direct effects on such phenomenon as the proliferation