Structure of the MlaC-MlaD complex reveals molecular basis of periplasmic phospholipid transport by Wotherspoon, P, Johnston, H, Hardy, DJ, Holyfield, R, Bui, S, Ratkevičiūtė, G, Sridhar, P, Colburn, J, Wilson, CB, Colyer, A, Cooper, BF, Bryant, JA, Hughes, GW, Stansfeld, PJ, Bergeron, JRC, Knowles, TJ