Yahoo Finance

Theranos, the blood-testing startup with a $9 billion valuation, has had a turbulent year.

On Wednesday, the company announced major changes, including that its president and chief operating officer Sunny Balwani, who served as CEO and founder Elizabeth Holmes' second-in-command, is retiring.

Here's a review of the events that led up to this point over the last year.

(Dragan Radovanovic/Business Insider)

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