One of her generation's most admired stage and screen actresses reflects on being an emancipated child star on 'Dawson's Creek,' pursuing naturalism in films like 'Brokeback Mountain,' 'Wendy and Lucy' and 'Blue Valentine' before turning more recently to expressionistic work in 'My Week with Marilyn' and 'Fosse/Verdon' and the challenges and rewards of playing Steven Spielberg's mother.

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