Sussex Research Laboratories Inc. has provided researchers with the most extensive selection of commercially available, high purity glycosylated amino acids (glycoamino acids). In nature, protein glycosylation, forming glycosylated proteins or glycopeptides, is a fundamental posttranslational modification process that controls protein shape, half-life and essential biological pathways ranging from protein trafficking to cell adhesion. Glycoamino acids are the basic sites of protein glycosylation, most commonly occurring at serine and threonine in the case of O-linked proteins, and at asparagine (Asn) in the case of N-linked glycoproteins.