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A description of any additional details concerning the sample support.
This grid plus sample was kept at -170 deg C for a month before use
A 3-microliter sample of each PDC preparation (~0.35 mg/ml containing 20 microgram/ml bacitracin) was deposited, blotted, and quick-frozen in liquid ethane on a glow-discharged carbon-coated holey grid. The vitrified samples were recorded at ~1 micrometer under focus at ~10 e/Angstroms-squared dose for image processing. A second exposure of ~2-3 micrometer under focus was recorded and used as an aid in analyzing the images with the focal pair method. The images were recorded on Kodak SO 163 film at a nominal magnification of x50,000 in a JEOL JEM 1200 electron microscope operated at 100 kV.
Orientation of 4300 Ribosome projections identified by 3D projection matching using low resolution reference. (Penczek et al., 1994). Reconstruction (SIRT) simultaneously performed CTF correction (Zhu et al. submitted).