D180° and V180° sandwich explants also showed a trend of increasing stiffness from gastrula to neurula stages ( Figure 5B ) with both showing an increase between stages 12 and 14 (G+4.3 and 7.6hr) but showed no significant differences from each other at any stage.
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Large, long range tensile forces drive convergence during <i>Xenopus</i> blastopore closure and body axis elongation.
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