Applied DNA Sciences, Inc., a biotechnology company, develops and commercializes technologies to produce and detect deoxyribonucleic acid (DNA) in the Americas, Europe, Asia, and internationally. It operates through three segments: Therapeutic DNA Production Services; MDx Testing Services; and DNA Tagging and Security Products and Services. The Therapeutic DNA Production Services segment develops and commercializes the LinearDNA platform, which enables a cell-free manufacture of high-fidelity synthetic DNA sequences for use in nucleic acid-based therapeutics. The MDx Testing Services segment provides clinical molecular diagnostics (MDx) testing and clinical laboratory testing services; COVID-19 testing services, including test scheduling, sample collection, and automated results reporting for higher education institutions, private clients, and businesses under the safeCircle trademark; polymerase chain reaction (PCR) for production and detection of DNA and RNA; and MDx test kits and related supplies, as well as Isotopic analysis testing services.