Proteins are still gaining importance in the pharmaceutical world, where they are used to improve our arsenal of therapeutic drugs and vaccines and as diagnostic tools. Proteins are different from "traditional" low-molecular-weight drugs. As a group, they exhibit a number of biopharmaceutical and formulation problems. These problems have drawn considerable interest from both industrial and aca- demic environments, forcing pharmaceutical scientists to explore a domain previ- ously examined only by peptide and protein chemists. Biopharmaceutical aspects of proteins, e.g., low oral...