Giotto Biotech has an extensive catalog of proteins produced through expression in E. coli, and a custom production service is available. We specialize in proteins labeled with stable isotopes, typically 13C, 15N and 2H. Some examples of the proteins already produced by Giotto's staff include matrix metalloproteinases, S100 proteins, Fe-S proteins, copper chaperones, DO1, calmodulin and other calcium-binding proteins, soluble fragments of membrane proteins, and intrinsically disordered proteins such as amyloid beta 1-40 and 1-42 and alpha-synuclein. The quality of our products is guaranteed by mass spectrometry and NMR spectra.