Applied DNA Sciences is a biotechnology company that develops and commercializes technologies to produce and detect DNA. It operates through three segments: Therapeutic DNA Production Services, MDx Testing Services, and DNA Tagging and Security Products and Services. The company offers a range of services, including clinical molecular diagnostics testing, COVID-19 testing, and DNA tagging for supply chain security. It was founded in 1983 and is headquartered in Stony Brook, New York.