Erratum
The report "Protein crystal growth in microgravity" by L. J. DeLucas et al. (3 Nov. 1989, p. 651) contained a typographical error regarding the B values of space- and Earth-growth crystals. The last sentence of the first paragraph on page 652 should have read, "The slopes of these plots are directly related to the difference in overall B values for two different crystals, b (Earthgrowth) and a (space-grown)."