Corrections and Clarifications

Erratum

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Science  12 Aug 1988:
Vol. 241, Issue 4867, pp. 774
DOI: 10.1126/science.241.4867.774

Abstract

The width of the shell shown on the cover of the 1 July issue was given incorrectly in the caption on page 5. The shell is approximately 2 millimeters im width, not 2 micrometers.