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Science 10 July 1981:
Vol. 213. no. 4504, p. 156
DOI: 10.1126/science.213.4504.156-f
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Erratum

The computer-processed image of wave propagation in aggregating slime mold cells shown on the cover of the 24 April 1981 issue was incorrectly attributed. The image was produced by M. J. Potel in the computer graphics facility of the Department of Biophysics and Theoretical Biology at the University of Chicago.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)