How does the Cnidocyte of a Cnidarian Function? A cnidocyte, cnidoblast or nematocyte, is a type of venomous cell unique to the phylum Cnidaria (corals, sea anemones, hydrae, jellyfish, etc.).
Such cells are called stem cells. Stem cells are those undifferentiated cells which have the potential to become specialized to form a specific type of cell. For instance, mesenchymal stem cells are a type of stem cells which can differentiate into osteoblasts, chrondocytes, myocytes and adipocytes.
Undifferentiated connective tissue disease (UCTD) is a condition which melts together features of various classical diseases. The classical connective tissue diseases include rheumatoid arthritis, systemic lupus erythematosus, scleroderma, polymyositis, dermatomyositis, and Sjogren's syndrome. UCTD is referred to as undifferentiated because the features that it displays are not adequate as criteria for any one of the classical connective tissue diseases. These features include signs and symptoms as well as immune and blood tests of these diseases. The fact is that UCTD can evolve slowly, even over years, to become one of the classical connective tissue diseases or it may never evolve at all. Also, the very features which suggest UCTD can resolve and the disease go away entirely.