Murray uses brewer's yeast to study the genetic processes inside cells. Brewer's yeast offers excellent opportunities for studying the genetics and processes in cells similar to ours. However, studying yeast cells is difficult due to the small size of their cells and chromosomes. Murray describes a novel method of identifying the location of the yeast cell's DNA by tracking the DNA with phosphorescent light, thus allowing for scientists to clearly view and manipulate the cell's DNA as it moves though the cell.