Fig. 8. Kinetics of blastopore closure in Xdd1-injected embryos. (A) Kinetics of closure for the embryos shown in Fig. 7A-D. (B) The mean kinetics of closure for eight independent blastopore closure experiments (n=20 control, 12 ventral, 11 dorsal, 16 circumferential). Within each day, and on average, we observed increasingly severe defects in blastopore closure in ventrally, dorsally and circumferentially injected embryos.