Figure 2.

Main countries with documented Se-rich soils. The presence of Se-rich soil is not uniform in the world, but some countries such as Egypt, China, India, Norway, and USA stand out among the others. On the other hand, some plants are more capable of retaining Se, for example - Bertholletia excelsa (Brazil nuts), which is a typical tree of the northern region of Brazil. Se, selenium; SeMet, selenomethionine; SeCys, selenocysteine (Figure illustration by Francisco Irochima Pinheiro).