wildtype 
"'-iVilv. 
corkscrew 
Darkfield preparation of a wild-type and a corkscrew embryo. The twist in 
the mutant embryo is due to a perturbed establishment of cell fates at the 
termini of the blastoderm. 
From Perkins, L.A., Larsen, I., and Perrimon, N. 1992. Cell 70:225- 
236. Copyright © 1992 by Cell Press. 
