In this first book of the Medical Masterclass series, Scientific background to medicine 1, we cover the aspects of basic science that are essential to practicing physicians. This third edition of Medical Masterclass is updated to reflect changes to the MRCP(UK) exam. The Medical Masterclass books have an easy-to-read format, clinical images and highlighted key points throughout. Topics include immunology and immunosuppression; cell biology; anatomy; genetics and molecular medicine; biochemistry and metabolism; and physiology. This book also includes self assessment questions (SAQs) in the style of the MRCP(UK) Part 1 exam. Considered to be the most comprehensive MRCP(UK) revision package available. Produced by the Royal College of Physicians, the Medical Masterclass series is written by over 75 authors and contributors, under the editor- in-chief Dr John Firth DM FRCP.