The following statements are true EXEPT:
a. the immune system is composed of lymphoid organs and immune cells
b. all immune cells (tissue cells and leukocytes) posses a common origin: the haematopoetic medullar pluripotent stem cells
c. the immune cells are limited in number, not being renewed along the life time
d. the haematopoesis possesses 2 lines of differentiation: myeloid and lymphoid
e. the lymphoid organs are classified in 2 categories
c. the immune cells are limited in number, not being renewed along the life time
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