The implicit meaning is that someone who will never have the requirement, access or necessity for something, will never know its value. These sayings are used in a disparaging way; pigs and monkeys both are implied to be inferior to those that appreciate pearls and ginger, respectively. This is laughable human hubris.
Aplastic anemia is a rare disease in which the bone marrow and the hematopoietic stem cells that reside there are damaged. This causes a deficiency of all three blood cell types (pancytopenia): red blood cells (anemia), white blood cells (leukopenia), and platelets (thrombocytopenia). Aplastic refers to inability of the stem cells to generate mature blood cells. It is most prevalent in people in their teens and twenties, but is also common among the elderly. It can be caused by exposure to chemicals, drugs, radiation, immune disease, and heredity. However, in about half the cases, the cause is unknown. The definitive diagnosis is by bone marrow biopsy; normal bone marrow has 30â70% blood stem cells, but in aplastic anemia, these cells are mostly gone and replaced by fat.
Aplastic anemia is the medical term for bone marrow failure. We treat patients with aplastic anemia at our Bone Marrow Failures Disorders Program at the Johns Hopkins Kimmel Cancer Center. The bone marrow, a spongy tissue inside the bones, is the factory for all blood cell lines -- red cells, white cells, and platelets.