Phosphorothioates We can synthesize oligonucleotides used for antisense and antigene applications. Please contact us for more details or to request a quote. Contact Us Address Fidelity Oligos LLC7965 Cessna AveGaithersburg, MD 20879 Email Support@fidelityoligos.com Telephone/Fax Phone: 301-527-0804Fax: 301-527-8250