MEDICAL SCIENCES. For the article “Heparin and cancer revisited: Mechanistic connections involving platelets, P-selectin, carcinoma mucins, and tumor metastasis” by Lubor Borsig, Richard Wong, James Feramisco, David R. Nadeau, Nissi M. Varki, and Ajit Varki, which appeared in number 6, March 13, 2001, of Proc. Natl. Acad. Sci. USA (98, 3352–3357), the authors note the following correction. On page 3355, the URL for nearcount software was incorrectly listed as http://vis.fdsc.edu. The correct URL is http://vis.sdsc.edu.
. 2001 Apr 24;98(9):5369. doi: 10.1073/pnas.111148898