Many boldface names enabled the stratospheric rise of the blood-testing start-up Theranos: two former secretaries of state, a former secretary of defense, two former senators, a retired admiral, venture capitalists, scientific luminaries and a prestigious clinic.

None has been more important to Theranos than Walgreens.

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“I’d be shocked if Walgreens doesn’t have a contractual right to terminate the contract right now,” said George Triantis, an expert on contract design and dispute resolution at Stanford Law School.