DNA in all living things. Conceptual artwork representing the universality of DNA (deoxyribonucleic acid) and the genetic code in all living things. The strands of the DNA double helix make up a mans face. The helix contains yeast (a fungus, top), a flowering plant (upper right), a sheep (upper centre), a fruit fly (centre left), a pig (lower right) and a flatworm (bottom). Many of these organisms have been used in genetic research: sheep have been cloned, pigs have been genetically modified so that their organs can be transplanted into humans, fruit flies are used to study the effects of genes and yeasts have been used to produce human DNA for the Human Genome Project.