This presentation discusses the maturation and activation of T-cells and B-cells in the lymphatic system. It explains how they work together to provide defense mechanisms and carry out immune responses. The presentation also covers the organs related to the maturation of T and B cells, the functions of the lymphatic system, and the negative selection of immature B cells. The subject is BHS104A and the course code is 00274007T. The presentation is suitable for students studying nursing, healthcare, and related subjects.