JAMES GATHANY / CDC / SCIENCE PHOTO LIBRARY JAMES GATHANY / CDC / SCIENCE PHOTO LIBRARY
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Sexually transmitted disease diagnosis. Biologist preparing a 'mastermix' for a multiplex real time polymerase chain reaction (PCR) assay, which can differentiate between four sexually transmitted organisms known to be the cause for vaginal and urethral discharges. PCR produces large amounts of replicated DNA (deoxyribonucleic acid) or RNA (ribonucleic acid) molecular sequences. Using this process, very small amounts of these nucleic acid molecules can be analysed upon the completion of the replication process.
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