In the article “κ-Opioid Receptor Agonists Modulate Visceral Nociception at a Novel, Peripheral Site of Action,” by S. K. Joshi, Xin Su, Frank Porreca, and G. F. Gebhart, which appeared on pages 5874–5879 of the August 1, 2000 issue, erroneous information was given for an antibody. The PharMingen KA8 antibody discussed in the 10th paragraph of Materials and Methods should have been listed as a PharMingen polyclonal antibody.