A 4D visualization of zebrafish somitogenesis and neural keel formation. The Quicktime movie shows progressively dorsal optical sections in a segmenting embryo. Note the midline alignment of neuroepit...

Anterior and posterior regions of a C. elegans embryo are determined by PAR protein distribution. PAR-2, shown in green marks the posterior region of the embryo and PAR-6, shown in red, marks the ante...

Anterior and posterior regions of a C. elegans embryo are determined by PAR protein distribution. PAR-2, shown in green marks the posterior region of the embryo and PAR-6, shown in red, marks the ante...

Anterior and posterior regions of a C. elegans embryo are determined by PAR protein distribution. PAR-2, shown in green marks the posterior region of the embryo and PAR-6, shown in red, marks the ante...

Zebrafish embryo showing the alignment of cells involved in the formation of the neural tube, which will become the spinal cord and brain.

Zebrafish midbrain hindbrain morphogenesis as seen with bodipy-ceramide and fluorescent dextran labeling. Video made available by Mark Cooper through Zebrafish - The Living Laboratory.

Light micrograph of a human embryo at the blastocyst stage, about six days after fertilization. The embryo is in the process of "hatching" out of the zona pellucida - the tough outer membrane - just b...

Zebrafish midbrain hindbrain morphogenesis as seen with bodipy-ceramide and fluorescent dextran labeling. Video made available by Mark Cooper through Zebrafish - The Living Laboratory.

Neural plate of Xenopus laevis at early neural tube closure.

Zebrafish midbrain hindbrain morphogenesis as seen with bodipy-ceramide and fluorescent dextran labeling. Video made available by Mark Cooper through Zebrafish - The Living Laboratory.