Closeup of Plate (image) Princeton University Caption The plating experiment in this image shows how yeast strains vary in resistance to a drug. Different strains (horizontal rows) were grown at cell densities that decrease from left to right. Sensitive strains only are capable of growing when plated at high density, while resistant strains are capable of growing even at low density. By studying very large populations of yeast, Princeton scientists have developed a new way to identify the hidden genetic material responsible for genetically complex drug resistance traits. Credit Ian Ehrenreich/Kruglyak Lab Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.