This extensive book provides information regarding the current progress in protein kinases. Proteins are the hardest working part of a cell. As controllers of protein function, protein kinases are concerned with the regulation of cellular activities through complex signaling corridors, permitting fine tuning of physiological tasks. This book is a contributive effort, with inputs from experts in their respective spheres, showcasing the spirit of collaborative efforts across fields and boundaries which exist in contemporary science. In this book, light has been shed on existing works and on recent information on the purpose of protein kinases in different systems. Also discussed are the consequences of these discoveries pertaining to disease, treatment, and medicinal development.