Mutant Population (IMAGE) Penn State Caption (Left) A schematic of drug resistance across a population of patients. Patients with initially sensitive disease (blue) are treated with a drug. Different genetic mutations cause different resistance mutations (red, yellow, and green). (Right) Tallying up the number of patients associated with each resistance allele, some alleles are more common in the clinical population than others. Credit Scott Leighow, Penn State Usage Restrictions Non commercial use only License Licensed content 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.