The process of producing antibodies against a phospho-residue is more complicated than traditional antibody production using peptide immunogens. Phospho-specific antibodies are generated using peptides containing one or more phosphorylated amino acids. There are three residues which can be phosphorylated: Serine (S), Threonine (T) and Tyrosine (Y).More information, please visit the website: http://www.creative-diagnostics.com/Custom-Phospho-Antibody-Production.html