From Dr Ivy Bullen in 1999 Disclaimer: Notes recorded by Debby Blettner Immune System: Dr Bullen first explained about the different cells present, the T Cells, T Helper Cells, T Suppressor Cells, Natural Killer Cells and B Cells. The Thymus is the training ground for the immune system and is located under the chest bone, the … Continue reading The Immune System: Helpful Gifts For Our Survival