Both of the formulations have been investigated in phase I clinical trials (NCT 01148953, 2010, “A Phase 1, Randomized, Single-Blind, Placebo-Controlled, Dose Escalation Trial to Evaluate the Safety and Tolerability of a Single Dose of Intravenous ALN-TTR01 in Patients With TTR Amyloidosis”) and (NCT 01559077, 2012, “A Phase 1, Randomized, Single-blind, Placebo-Controlled, Single Ascending Dose, Safety, Tolerability and Pharmacokinetics Study of ALN-TTR02 in Healthy Volunteers”). The gene discussed is TTR; the disease is amyloidosis.