Figure 1. Fig. 1. Stereorepresentation of the electron-density map. The 2 (F[o] F[c]) electron density contoured at 1.0 at the polymerase active site is well defined for the refined model (stick representation).
F[c])
electron density contoured at 1.0 
at the
polymerase active site is well defined for the refined model
(stick representation).