Our readers have expressed curiosity about the technology of a clinical laboratory. “Definitions by Matt” will be a continuing series to highlight your questions and provide insight into the clinical laboratory processes and terminologies. “What is PCR (polymerase chain reaction)?” DNA, or deoxyribonucleic acid, is present in every living cell from Humans to plants to bacteria and is used to store information. DNA is found in long chains of building blocks, called bases. Cells contain ...