In technical standards, use of a certain clause may be discouraged or superseded by new clauses. As an example, in the Ethernet standard IEEE 802.3-2012, Clause 5 (Layer Management) is "deprecated" by Clause 30 (Management), except for 5.2.4. The term "deprecated" may also be used when a technical term becomes obsolete, either through change or supersession. An example from paleontology is the previously deprecated term "Brontosaurus"; before being re-recognized as a unique genus, it was considered a popular, yet deprecated, name for the genus "Apatosaurus". Some examples of deprecated terms from medicine include "consumption" (tuberculosis), "grippe" (influenza), and "apoplexy" (stroke). In chemistry, the international standards organization IUPAC (International Union of Pure and Applied Chemistry) has deprecated the term "methyl ethyl ketone", and now recommends using the term "ethyl methyl ketone" instead.