Fig. 2. Unbiased map and refined model stereoview. N-terminal residues of the proteasome α6 subunit are shown with the 14-fold averaged simulated annealing omit 2F_o – F_c map contoured at 2.2 times the r.m.s.d. and shown with a 1.5 Å cover. All 14 N-terminal tails in the asymmetric unit through residue 26 (T.acidophilum numbering) were omitted from the model. The view direction is from the middle of the pore with the 7-fold axis vertical.