— In “Evolution and function of ubiquitin-like protein-conjugation systems” by Mark Hochstrasser (Nature Cell Biol. 2, E153–E157; 2000)

The third sentence in the Fig. 4 legend should read: “Two catalytic cysteine residues, which are necessary for sulphur moblization in the suplhurtransferase, are retained in the ubiquitin/Ubl-conjugation systems.” Figure 2b should be as shown below.

figure 1