This handbook is the first comprehensive book of its kind reviewing the clinically relevant current status of tissue kallikrein and kallikrein-related peptidases research. Since several members of the KLK family are key players in (patho-)physiological processes, structural, functional, and regulatory studies are under way to develop new strategies to prevent and treat disorders to which individual members of the KLK protease family contribute significantly. The goal of this book is to inform clinicians, physician scientists and researchers about the prominent role of the multifaceted and interactive KLK system in normal physiology and pathological organ function.