Atara Biotherapeutics, Inc. (NASDAQ:ATRA) Q1 2019 Earnings Conference Call May 9, 2019 8:30 AM ET Company Participants John Craighead - Vice President of Investor Relations and Corporate Communications Isaac Ciechanover - President and Chief Executive Officer Dietmar Berger - Global Head of Research and Development Utpal Koppikar - Chief Financial Officer Conference Call Participants Anupam Rama - JPMorgan John Newman - Canaccord Salim Syed - Mizuho Matt Phipps - William Blair Maryana Breitman - Goldman Sac ...