I've been expecting a correction for some time now....but the volatility from yesterday gave us the correction we needed.
Just remember that this is a stock that is moving on speculation and momentum. These stocks have violent moves to the upside and even more violent swings to the downside especially when there are gap moves like what we're seeing today.
Amazon.com in the early days did much the same thing, Tesla did this recently and there was a sharp correction yesterday and now there is secondary buying causing another somewhat muted move to the upside.
Organovo is such a stock. You'll experience euphoria while it's going up and will a bottle of Digel when it's going down........