For more properties and a generalization of the partial trace, see traced monoidal categories. They can trace their ancestry directly to the Sayyids of Iraq. Still, many Brazilians can not trace back their real origin easily. The Anabaptists trace their origins to the Radical Reformation. Some writers trace its origin to Thomas Aquinas. In Mexico, a sizeable population can trace its ancestry to France. This leads to an elaboration of the first memory trace. Today, all Percherons trace their ancestry to this stallion. Carbon dioxide also occurs at trace levels. They all deactivate their phones so that nobody can trace them. Lithium is present in biological systems in trace amounts; its functions are uncertain. Some trace the divisions back further to the Classical period. As a result, the magnetic field vectors would trace out a second helix if displayed. We are committed to leaving no physical trace of our activities wherever we gather. Traceability is the capability to trace something.