Biochemistry. In the article “Enhancer blocking activity located near the 3′ end of the sea urchin early H2A histone gene” by Franco Palla, Raffaella Melfi, Letizia Anello, Maria Di Bernardo, and Giovanni Spinelli, which appeared in number 6, March 18, 1997, of Proc. Natl. Acad. Sci. USA (94, 2272–2277), the following printer’s error should be noted. On page 2276, the last sentence of the first paragraph should read: “From these results we may exclude that sns represses transcription by an active silencing mechanism with the binding of one or more repressor molecules.” In the printed paper, the word “exclude” was incorrectly replaced with the word “suggest.”