Theranos founder Elizabeth Holmes turned herself in at a minimum-security prison in Texas to begin serving her prison sentence for defrauding investors in the failed blood-testing startup once valued at $9 billion. #ElizabethHolmes #Theranos #Prison #News #Reuters #newsfeed Subscribe: http://smarturl.it/reuterssubscribe Reuters brings you the latest business, finance and breaking news video from around the globe. Our reputation for accuracy and impartiality is unparalleled. Get the latest news on: https://www.reuters.com/ Follow Reuters on Facebook: https://www.facebook.com/Reuters Follow Reuters on Twitter: https://twitter.com/Reuters Follow Reuters on Instagram: https://www.instagram.com/reuters/?hl=en