Gastrulating Drosophila embryo imaged from the ventral side. Nuclei appear green (Histone-GFP label). The red spots are fluorescent beads injected into the embryo to quantitatively track tissue deformation.
Ferrofluid droplet moved inside fruit fly embryo by externally applied magnetic field. The magnet appears in the right bottom corner. Note strong elastic recoil of the ferrofluid droplet once the magnet is retracted; this implies the tissue is elastic on the time-scale of the experiment.
Microspheres manipulated inside a fly embryo using magnetic forces. Note elastic response following the removal of the field.
WGA-conjugated fluorescent beads are used here to track the surface of the embryo during gastrulation.
Ill-fated and by now conclusively rejected model of gastrulation.
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