This book compiles important information regarding protein phosphorylation and human health contributed by veteran scientists. The book elucidates the most significant research topics grouped under three sections: tyrosine kinases in receptor signaling and human diseases; protein kinases and phosphates in cell cycle regulation; and histidine kinases in two-component systems. It connects the basic protein phosphorylation channels with human health and diseases. This book also comprises of excellent figure illustrations and will be a valuable read for a broad spectrum of readers.