TOKYO and BURLINGAME, CA -- (MARKET WIRE) -- May 02, 2007 -- Y's Therapeutics, a privately held biopharmaceutical company, announced the initiation of a Phase II clinical trial of its lead compound, YSPSL, for prevention of ischemic reperfusion injury (I/R) in liver transplant patients. The clinical trial is a randomized, double-blind, placebo-controlled study designed to enroll 12 patients undergoing cadaveric orthotopic liver transplantation at Dumont UCLA Transplant Center, a leading US liver transplant center.