The doctors become nostalgic when George O’Malley’s mother, Louise, returns to Seattle Grace for medical help after a botched surgery at a neighboring hospital, the residents are inspired by a medical miracle when they witness a harvested heart that continues to beat outside the body; a new pediatric fellow excites Arizona and makes Alex feel threatened, Jackson lets his suspicions about Mark and Lexie interfere with his work, and Henry and Teddy have their first marital fight when he expresses interest in pursuing medical school.

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