About the Cover
Pulsed laser-induced GFP expression in C. elegans embryos, 3 hr after infrared laser heat shock of individual cells during the 4-cell stage. Each pair shows (at left) GFP in only the descendants of illuminated cells ABp, EMS, ABa, or ABp, and (at right) AceTree simulation with expected positions of the descendants of each targeted cell labeled in green. From Churgin et al., pp. 1827–1832.