Winston-Salem-based KeraNetics is quadrupling its manufacturing space in Wake Forest Innovation Quarter as it prepares to hopefully begin human clinical trials next year. The regenerative medicine firm, headed by CEO Kim Westmoreland, is moving into space at 200 E. First St. that was formerly occupied by drug development company Targacept, and using a $250,000 small business research loan from the N.C. Biotechnology Center to help finance the renovation. Westmoreland said Thursday that the roughly…