 Watson's first textbook, "The Molecular Biology of the Gene", set a new standard for textbooks, particularly through the use of concept heads—brief declarative subheadings.His next textbook was "Molecular Biology of the Cell", in which he coordinated the work of a group of scientist-writers.His third textbook was "Recombinant DNA", which described the ways in which genetic engineering has brought much new information about how organisms function.