Sucrose gradient profiles of 3H uridine labeled ribosomal subunits isolated from E. coli cells grown with or without 10μg/mL antibiotics. Gradient profiles for wild type (a), RNase III deficient (b), RNase E deficient (c), RNase I/PH/R deficient (d), RNase G deficient (e), and RNase I/II/PNPase/PH deficient (f). Results are the means of 2 gradient profiles.