MODEL RELEASED. Genetic research. Dr. Pete Middleton analysing DNA (deoxyribonucleic acid) variations. DNA controls the growth and development of all living things. DNA is divided into discrete lengths called genes, each gene having a specific purpose. Dr. Middleton is studying the variations in genes that are involved in the immune response. By knowing which version of a gene a patient possesses it is hoped that ideal" therapies, for various conditions, can be developed for groups of patients."