Building on the success of their Source Book of Enzymes, John and Dorothy Chong White have assembled an exhaustive catalog of over 26,000 commercially available proteins, peptides, and amino acids, all arranged alphabetically and by sequence for fast access, and each replete with technical details and vendor information. Compounds can be easily located by either directly searching the appropriate section by chemical name, or by consulting the general index by name, synonym, or derivative formula. Peptides with known sequences may be found alphabetically by basic sequence (no modification) or by consulting the Sequences Index. A Glossary of Abbreviations and Acronyms makes it possible to quickly find compounds by their common names. Once the desired compound is located, the selection of the right product for an application is facilitated by presenting its specific technical data in an easy-to-use format that permits comparison across sources. This valuable data covers sequence, sequence modification, chemical derivatives, preparation form, purity, composition, activity, functionality, temperature/pH optima, as well as product notes that list known applications, compound importance, and literature references. The selected compound may then be ordered by using the catalog number provided and the Reagent Suppliers Index.