Theranos will fire 340 employees as it closes its clinical labs and Theranos Wellness Centers, wrote founder and CEO Elizabeth Holmes in a blog post Wednesday afternoon. The closing of the labs and wellness centers will affect employees in three states: Arizona, California and Pennsylvania. Theranos employs from 500 to 1,000 workers, according to LinkedIn and Glassdoor. "We will return our undivided attention to our miniLab platform," Holmes said in the post, referring to the 95-pound desktop diagnostic…