Sulphur is represented by the symbol 'S' in the periodic table and has an atomic number of 16. It is a naturally occuring element which is frequently found and regarded as an essential element for life. It is found in the amino acids methionine and cysteine. In cysteine the -SH group reacts with another -SH group on a different cysteine forming a disulphide bond .
- ↑ Berg J.,Tymoczko J. and Stryer L. (2012) Biochemistry. 7th edition, Basinstoke: Freeman.