As the University of Missouri's Columbia campus tries to rebound from racial unrest, the system's governing board is without minority representation after two black members resigned last week - leaving one-third of the nine seats vacant. All three departures happened after the Nov. 9 resignations of the university system's president, Tim Wolfe, and the Columbia campus' chancellor, R. Bowen Loftin, in the wake of protests over what some saw as university leadership's indifference to racial issues.