Correction

CELL BIOLOGY. For the article “S-nitrosoprotein formation and localization in endothelial cells,” by Yi Yang and Joseph Loscalzo, which appeared in issue 1, January 4, 2005, of Proc. Natl. Acad. Sci. USA (102, 117–122; first published December 23, 2004; 10.1073/pnas.0405989102), due to a printer's error in the Reagents section of Materials and Methods, the names of the chemical compounds for “MTSEA-Texas red” and “MTSEA biotin-X” were transposed. The correct chemicals and suppliers should read as follows: “The dye, MTSEA-Texas red, was purchased from Toronto Research Chemicals, Inc. (North York, ON, Canada), and 2-((6-((biotinoyl)amino)-hexanoyl)amino) ethylmethanethiosulfonate (MTSEA biotin-X) was purchased from Biotium (Hayward, CA).” In addition, under S-Nitrosoprotein Detection, “0.2 mM ascorbate” (page 118, column 1, line 28) should read “0.2 M ascorbate,” and under Organelle Staining, “dextrose-PBS” (page 118, column 1, line 48) should read “Dulbecco's PBS (DPBS).” The conclusions presented remain unchanged by these corrections.