 Scientists rarely depict all the particular details when describing a mechanism; representations are usually schematic, often depicted in diagrams (see the entry on  models in science).  Such representations may be called a “model of a mechanism”, or “mechanism schema”. A mechanism schema is a truncated abstract description of a mechanism that can be instantiated by filling it with more specific descriptions of component entities and activities. An example is James Watson’s (1965) diagram of his version of the central dogma of molecular biology: