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.
Cord blood stem cells â¼. Cord blood stem cells can be harvested from the umbilical cord of a baby after birth. The cells can be frozen (âcryopreservedâ) in cell banks and are currently used to treat children with cancerous blood disorders such as leukaemia, as well as genetic blood diseases like Fanconi anaemia. Treatment of adults has been more challenging, due to the low cell number obtained from one umbilical cord.