(From left) Zack Permutt, a second-year medical student and a student coordinator of the Cori Society; Larry J. Shapiro, M.D., executive vice chancellor for medical affairs and dean of the School of Medicine; Carl Frieden, Ph.D., professor of biochemistry and molecular biophysics; Robert A. Cavinder, St. Louis interim postmaster; Chancellor Mark S. Wrighton; and Courtney Lehew, a second-year medical student, unveil the Gerty Cori U.S. Postal Service stamp March 17 in Moore Auditorium. The stamp is one of four honoring American scientists. Cori’s stamp is unique in that it contains an error: In the sketch of the formula she developed, one of the lines that connects the formula attaches to the wrong element.