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Grey's Anatomy Latest Episode: Season 6, Episode 4 - 'Tainted Obligation'

When Meredith and Lexie's father, Thatcher, returns to the hospital with a failed liver, it's up to Meredith to save his life. Meanwhile, Izzie empathizes with a patient riddled with tumors, as Mark, annoyed with Cristina's competitive zeal, tricks her into assisting on an unusual surgery.

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Watch Grey's Anatomy: Season 6, Episode 4 - 'Tainted Obligation'

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