These dependencies provide the internal linkages hierarchy in the data, and direct the search path during interrogation and, among other things, reveal errors during data entry. The red bars indicate that this cell is made inapplicable through dependencies. It also shows the dependencies established by the states, so that state 4 for example only opens the character section 512-617, and handles the semantic equivalence of head and capsid. The dependencies build the internal hierarchy of the database. Semantic equivalencies and dependencies among the major morphological properties of virus particles.
Few viruses contain more than one component.
It is said that a picture is worth a thousand words. For example, text descriptions of key morphological characters become much more precise when they are linked in the character list to representative vignettes from electron microscope photographs. Thin section EM images of infected tissues are used to illustrate virus infection cycles and host pathology. Descriptions of all viruses generated from ICTVdB will be enhanced by EM images of the type species, irrespective of the presentation format selected. Not surprisingly, images of virus particles are among the most frequently accessed files in ICTVdB on the web.