Caste: Caste, any of the ranked, hereditary, endogamous social groups, often linked with occupation, that together constitute traditional societies in South Asia, particularly among encyclopÃdia britannica
Reticuloendothelial System (RES). a system of cells of mesenchymal origin in vertebrate animals and in man that can be converted to actively mobile phagocytic cells (macrophages).I.I.eticuloendothelial System (RES). a system of cells of mesenchymal origin in vertebrate animals and in man that can be converted to actively mobile phagocytic cells (macrophages). I.I.
These cells develop within the bone marrow, then migrate to the liver, where they complete their development into cells specially designed to protect the liver. These specialized cells are considered part of the reticuloendothelial system, a part of the immune system.