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How Well Do You Remember the Guest Stars of ER?

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How Well Do You Remember the Guest Stars of ER? Over its 15 years on the air, ER has had some pretty memorable guest stars — including a Gilmore Girls alum who's clocking in for the show's final episode tonight. Let's test your knowledge of which famous — and soon-to-be famous — stars appeared on the NBC medical drama over the past several years.

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