Proteins in human body

Bergquist, J., M. Palmblad, M. Wetterhall, P. Hakansson and K.E. Markides. Peptide mapping of proteins in human body fluids using electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry. Mass Spectrom. Rev. 21 2-15, 2002. 

Several essential amino acids contain sulfur therefore, sulfur is found in the proteins in human bodies. With the exception of the alkali metals and alkaline earth metals (the first two columns in the periodic table), virtually all of the metals and semimetals form compounds with sulfur, usually as sulfides (containing the ion S ") or as sulfates (containing the ion SO ). Therefore, because sulfur is such a common element in Earth s crust, there are large deposits of minerals that contain... 

---