Don't Deceive Me

Derek begins a clinical trial for an Alzheimer's therapy. Friction arises when he chooses to exclude Meredith from assisting with this research. Bailey uses Twitter to describe an abdominal surgery, provoking the Chief's ire - until the feed creates a degree of collaboration that spares a patient from a lifetime of serious diabetes following a pancreatectomy. Callie's concern over her perfectly normal pregancy symptoms drive new obstetrician Lucy Fields, Mark and Arizona to distraction.