title: Erratum.
abstract: In Table 1 (p. 351) of the report "Structure-activity studies of interleukin-2" by F. E. Cohen et al. (17 Oct., p. 349), reference 15 was incorrectly cited for the entries for the 1-29, 30-49, and 100-133 deletion mutants. For all three entries, the reference should have been (16).