William H. Rastetter, Ph.D. has served as a director on our Board of Directors since November 2011 and as Chairman of our Board of Directors since December 2011. From February 2012 to October 2012, he also served as our interim Chief Executive Officer. He is a Co-Founder of Receptos, Inc., a biopharmaceutical company that is a wholly-owned subsidiary of Celgene, where he served as a director and Chairman of the board of directors from 2009 to 2015, and was Acting Chief Executive Officer from May 2009 to November 2010. Dr. Rastetter is also Founder and has served as Chairman of the board of directors of San Diego Squared, a non-profit corporation focused on workforce development for students from underserved communities in San Diego County, since July 2020. Dr. Rastetter served as the Chairman of Illumina, Inc. ( Illumina ) from 2005 to 2016, and as a director of Illumina from 1998 to 2016. He was a founding director, interim Chief Executive Officer, and Chairman of Grail, Inc. which was acquired by Illumina in 2021. Dr. Rastetter has served as a member of the board of directors of Neurocrine since February 2010, and as the Chairman of the board of directors since May 2011. Dr. Rastetter has served as a director of Regulus Therapeutics, Inc. (Nasdaq: RGLS) since April 2013 until its acquisition by Novartis in June 2025. He served as a member of the board of directors of Dar Bioscience, Inc. (Nasdaq: DARE), previously known as Cerulean Pharma, Inc., since July 2017, and as its Chairman of the board of directors since July 2019. Dr. Rastetter has served on the board of Iambic Therapeutics since May 2023. He has also served as an advisor to Illumina Ventures, a genomics focused venture firm, since April 2016. Dr. Rastetter served as a Partner at the venture capital firm Venrock from 2006 to February 2013. Prior to that, Dr. Rastetter was Executive Chairman of Biogen Idec, from the merger of the two companies (Biogen and Idec Pharmaceuticals) in 2003 through the end of 2005. He joined Idec Pharmaceuticals at its founding in 1986 and served as Chairman and Chief Executive Officer. At Idec Pharmaceuticals he was a co-inventor of rituximab, the first monoclonal antibody approved by the FDA for cancer therapy. Prior to Idec Pharmaceuticals, he was director of Corporate Ventures at Genentech, Inc. ( Genentech ) and also served in a scientific capacity at Genentech. Dr. Rastetter held various faculty positions at the Massachusetts Institute of Technology and Harvard University and was an Alfred P. Sloan Fellow. Dr. Rastetter holds a Ph.D. and M.A. in chemistry from Harvard University and an S.B. in chemistry from the Massachusetts Institute of Technology. The Board of Directors has determined that Dr. Rastetter is qualified to serve on our Board of Directors due to his extensive experience in the biotechnology industry, his broad leadership experience with Idec Pharmaceuticals and on several boards of biotechnology companies, and his experience with financial matters.