||P.514 left column top paragraph: "The small subunit (30S in bacteria and archaea, 40S in eukaryotes) has the decoding function, whereas the large subunit (50S in bacteria and archaea, 60S in eukaryotes) catalyses the formation of peptide bonds, referred to as the peptidyl-transferase activity (BOX 1). The
bacterial (and archaeal) small subunit contains the 16S rRNA and 21 r-proteins (Escherichia coli), whereas the eukaryotic small subunit contains the 18S rRNA and 32 r-proteins (Saccharomyces cerevisiae: although the numbers vary between species). The bacterial large subunit contains the 5S and 23S rRNAs and 34 r-proteins (E.
coli), with the eukaryotic large subunit containing the 5S, 5.8S and 25S/28S rRNAs and 46 r-proteins (S. cerevisiae: again, the exact numbers vary between species)." In prokaryotes a small 30S ribosomal subunit contains the 16S rRNA. The large 50S ribosomal subunit contains two rRNA species (the 5S and 23S rRNAs). Bacterial 16S, 23S, and 5S rRNA genes are typically organized as a co-transcribed operon. E. coli has seven copies of the operon dispersed through the genome