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Elizabeth Holmes claps back against serious allegations about Theranos

For the first time in her criminal-fraud trial, Elizabeth Holmes on Tuesday took aim at the most serious allegations made against her by prosecutors, offering a narrative of herself as a well-intentioned if inexperienced entrepreneur who had some success in her effort to transform health care.

Elizabeth Holmes denies deception at her criminal trial

Biotechnology entrepreneur Elizabeth Holmes, a former billionaire accused of engineering a massive medical scam, expressed some remorse while on the witness stand Tuesday, but denied trying to conceal that her company's blood-testing methods weren't working as she had promised.