The CMY colours (commonly mistaken for Blue, Red and Yellow) are the answer when printing as mixing any two will form one of the darker RGB colours. The mix of all three CMY colours creates Black, although in practice this is very muddy.
White blood cells, like all blood cells are created in the bone marrow from certain stem cells. However, some lymphocytes are created but undeveloped or immature.
1 It also is part of the lymphatic system and produces lymphocytes, a type of white blood cell that are a part of the immune system that helps to prevent and fight infection. 2  The spleen also acts as a reservoir for red blood cells and platelets, should the body need them. It also is part of the lymphatic system and produces lymphocytes, a type of white blood cell that are a part of the immune system that helps to prevent and fight infection. 2  The spleen also acts as a reservoir for red blood cells and platelets, should the body need them.