A contraction wave circulating across a stage 18 medaka embryo over a 2.5-min interval (30 sec between each image). The embryo is ensheathed by a chorion which possesses numerous filamentous villi. Th...

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...

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 at 75% epiboly. The view is from the animal pole. The focal plane is deep within the blastoderm. The focal plane changes as the embryo rolls during the sequence. The fluorescent lipid...

A human sixteen-cell embryo, also called a morula (latin for mulberry). The embryo has gone through four cycles of cell division to get to this stage and the cells have undergone compaction whereby th...

Scanning electron micrograph of a 6 day old human embryo beginning to implant into the lining of the uterus (endometrium). As implantation progresses, the inner cell mass begins to form into the bila...

A live developing sea urchin embryo was imaged using differential contrast microscopy to enhance cellular details. Each minute a through focal series (Z-series) of micrographs was acquired to capture...

In situ hybridizations showing the localization of bicoid (top), oskar (middle) and gurken (bottom) mRNAs in the stage 10 Drosophila egg chambers. These localizations define the anterior- posterior a...

This image of the vascular system of a chicken embryo taken two days after fertilization is a composite of two different images taken with an upright fluorescent dissecting scope. The egg's shell was...

A 2.75 hour Zebrafish embryo; the same embryo as in CIL 37403 --later in blastoderm development. The video shows dynamics in a perisagital section of the embryo. The sequence shows blastomeres dividin...