Genesis 9 Pose Controls

Good morning. I'm having my first look at Genesis 9--in many ways its the rebirth of the original Genesis series--, but my question, and I admit I might be missing something is, why is there no "Mouth Open" slidder in the Pose Controls? I needed to open it up to have a look (the seperate eyes and mouth remind me of realworld ball joint dolls, that you can customize). Thanks.
Comments
"Jaw open" slidder
Thank you, that did the trick.