Keratinocytes – The primary type of cell found in the epidermis, the outermost layer of the skin.
Osteoblast – Cells that form new bone. They also come from the bone marrow and are related to structural cells.
Osteoclast – A large bone cell which absorbs bone tissue during growth and healing.
Osteoprogenitor – Cells located in the bone that play a role in bone repair and growth. These cells are the precursors to the more specialized bone cells (osteocytes and osteoblasts) and reside in the bone marrow.
T cells – (also called T lymphocyte): A type of white blood cell that is an essential part of the immune system. T cells are one of two primary types of lymphocytes–B cells being the other–that initiate immune response to antigens (foreign substances) in the body.
T helper cells (Th cells) – A type of T cell that play an important role in the immune system, particularly in the adaptive immune system. When stimulated by a specific antigen (foreign substance) they “help” the activity of other immune cells by releasing cytokines, small protein mediators that alter the behavior of target cells that in turn, express receptors for those cytokines. Subsets of Thcells (e.g., Th1, Th17) produce different cytokines.
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