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Theranos, a maker of devices that monitor drug reactions, has raised $45 million of an expected $100 million, according to a filing with the SEC. Started by former Stanford undergrad Elizabeth Holmes at the age of 19, the company is backed by Draper Fisher Jurvetson, ATA Ventures, Tako Ventures and Continental Properties Inc. Theranos develops real-time monitoring systems that enable patients and their doctors to make more informed medical decisions. The handheld devices wirelessly monitor a patient’s blood.

Theranos, which is based in Palo Alto, Calif. and was founded in 2003, has raised more than $70 million in funding to date.

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