Fig. 6: Ribbon represen-tation of the TnC - TnI fragment complex. The a-helices, ß-strands and loops of the TnC are coloured red, green and yellow respectively. The unwound and bent central D/E helix of TnC is shown in dark blue with the interdomain extended linker in black. The two calcium ions in the TnC C-lobe are shown as black spheres. The helical fragment of the TnI is drawn in light blue. In the uncomplexed form, the TnC has an elongated dumb-bell shape. [This figure is reproduced by courtesy of PNAS - Copyright 1998, National Academy of Sciences, USA].