Due to a typesetting error in Materials and Methods, the names of three individuals being acknowledged for materials provided were misspelled. The corrected passages appear below:

unc-78 alleles e1217, e1221, and st43 were provided by Drs. P. Hoppe and R. Waterston.

unc-60 (s1309) was provided by Dr. D. Baillie.

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© 2001 The Rockefeller University Press
2001
The Rockefeller University Press