Advances in Drug Research, Volume 22 focuses on the concepts and facts of drug research. This book is divided into four chapters. Chapter 1 discusses the use of atomic properties and atom-centered indices in QSAR models, while Chapter 2 describes the pharmacokinetics of peptides and proteins. The nuclear receptors, emphasizing the aspects of molecular and genomic pharmacology are elaborated in Chapter 3. The last chapter covers the medicinal chemistry of a vast group of agents acting on nuclear receptors. This publication is valuable to drug researchers and students interested in advances in drugs.