Spare body parts. Conceptual computer artwork of human legs stored in jars with a DNA autoradiogram in the background. This may represent the growth of human tissue to produce material for transplant surgery to replace defective or old body parts. This technology may develop from work with stem cells or research into cloning. The autoradiogram banding (pink & white) shows the genetic sequence in a sample of DNA (deoxyribonucleic acid).