PETER MENZEL / SCIENCE PHOTO LIBRARY PETER MENZEL / SCIENCE PHOTO LIBRARY
Harvard scientist Walter Gilbert studying a DNA sequencing autoradiogram, made in the course of research associated with the human genome project. The term "genome" describes the full set of genes expressed by an organism's chromosomes. A gene is a section of DNA that instructs a cell to make a specific protein. The task of constructing such a complete "blueprint" of genetic information for humans is divided into two main phases; mapping genes and other markers on chromosomes, and decoding the DNA sequences of genes on all the chromosomes. Numerous laboratories worldwide are engaged on various aspects of genome research.
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