（单词翻译:单击）
Dermatan sulphate - a glycosaminoglycan found in skin, tendon, blood vessel1 and heart valves.
Desmosomes -one of the types of cell junctions2 by which cells join or communicate with each other. Desmosomes consist of a round plaque3 of protein, desmoplakin on the cell membrane4. Into the plaque are attached fine filamanents which are part of the cell's cytoskeleton. So the plaque is attached to the skeleton of the cell. Where the filaments5 enter the plaque the are so dense6 as to be visible with a light microscope. They are then called tonofilaments. The plaque of one cell adheres to the plaque of another. This system of joining cells is designed to resist mechanical separation, so we see desmosomes joining epithelial cells which hold tightly to each other. If epithelium is processed for histology, some shrinkage occurs and the epithelial cells separate from each other, except where the desmosomes hold them together. The pulled out tags of cell membrane give these cells a star-like shape, and so they are called the stellate cells.
Desquamation - the detachment of cells from the surface of an epithelium.
Dextrans - polysaccharides made by bacteria. They have a slimy consistency7 and contribute to the sticky nature of plaque.
Differentiate8 - change in the pattern of genes9 expressed by a cell resulting in altered function, from a more primitive10 parent cell to a more specialised group of daughter cells.
Diphyodont - only two sets of teeth, one deciduous11 and one permanent (from "di" = two,"phyo+ = generation and "dont" =teeth). See also polyphyodont
Displacement12 - of a tooth refers to its movement within the confines of the tooth socket13. A tooth can be displaced more easily when forced in a lateral14 direction than when forced into the socket. Continual or frequent displacement of a tooth may lead to it repositioning itself in the socket.
DNA15 - Deoxyribosenucleic acid - a complex nucleic acid molecule16 which is used by cells to store genetic17 material as genes which control the structure of proteins and hence influencing all enzyme18 reactions. DNA is coiled in a single closed loop in procaryotes, but coiled round other proteins to form a chromosome19, and stored in the nucleus20 of eucaryotes
Duct - a tube which carries a secretion21 onto the surface of skin or mucosa.
