Here is some info for you:
http://www.moga.state.mo.us/statutes...3010000132.HTM
As a Missouri resident, I'm absolutely sure that if you walk into the DOR and talk with an *expert at the counter for clairification one day, then go in and talk to someone else the next day, you'll get two different answers--THEN, after choosing whichever answer seems correct to you, later upon your attempted registration you'll run into a snag for sure.
Good luck--I'm very interested in what you find out!