What triggers labor?: Conversation with Dr. Polina Lishko, Part 2

The how and when of uterine contractions--how are uterine contractions initiated? Whats the trigger or triggers? And when it happens too early, why does it happen too early?  are questions we haven't been able to answer as of yet.  Or maybe more accurately, we have a bunch of different possible answers, but we don't know how they interact with one another. Today I finish my conversation with Dr. Polina Lishko, who shares some of her research on a key mechanism for this trigger, and the other puzzles she and her team have been able to solve by understanding how this particular trigger works.