MEDICAL SCIENCES. For the article “A genetically clamped renin transgene for the induction of hypertension,” by Kathleen M. I. Caron, Leighton R. James, Hyung-Suk Kim, Scott G. Morham, Maria Luisa S. Sequeira Lopez, R. Ariel Gomez, Timothy L. Reudelhuber, and Oliver Smithies, which appeared in number 12, June 11, 2002, of Proc. Natl. Acad. Sci. USA (99, 8248–8252; First Published May 28, 2002; 10.1073/pnas.112222199), the authors note that on p. 8251, the first entry of line 7 in the body of Table 1 should read “Creatinine, Cr, μmol/liter” rather than “Creatinine, Cr, mmol/liter.” Also on p. 8251, in lines 8 and 9 in the left column, “mmol/liter” should read “μmol/liter.”