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Activate dendritic cells start biological clock A molecule specially modified by researchers at Baylor College of Medicine can reset the biological time clock for cancer vaccines, potentially making them stronger. In a report that appears in Character Medicine online, Dr. David Spencer and co-workers describe their approach to delaying the time of which crucial dendritic cells are activated by the immune system. This prolongs the proper time where the cancers vaccines can undertake their task, he stated. Dendritic cells are essential because they present to the immune system the proteins or antigens that cause the immune system to go into action.