Ak Medrese (White Koran School), dating back to 1409. The Lonely Planet Guide describes it as a transitional style: post-Seljuk Mongol, with an ogee (a pointed arch having on each side a reversed curve near the apex) above the main portal.
Unfortunately it was closed. It had earlier served as the local museum, which now has quarters of its own. It was in use now by the university, but they had locked the gate.