Exhibit 99.1

THOR-707, a Novel Not-alpha IL-2, Promotes All Key Immune System Anti-tumoral Actions of IL-2 Without Eliciting Vascular Leak Syndrome (VLS) Marcos E. Milla; Jerod L. Ptacin; Lina Ma; Carolina E. Caffaro; Hans R. Aerni; Kristine M. San Jose; Michael J. Pena; Robert W. Herman; Yelena Pavlova; David B. Chen; Taylor Ismaili; Shukuan Li; Jasmine Nguyen; Namit Singh; Laura K. Shawver; Lilia K. Koriazova; Ingrid B. Joseph Synthorx Inc. Research & Development, La Jolla, CA