Image Credits

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Developmental Biology Toolkit

8-cell embryos of the crustacean, Parhyale hawaiensis, injected with FITC-Dextran.  In the right three embryos, the injected cell is the "g" micromere (which gives rise to the germline), and in the left embryo, the injected cell is the "Mav" macromere (which gives rise to the visceral mesoderm and somatic mesoderm of the head).

Parhyale injection: Crystal Chaw and Nipam Patel

Early Development

Blastoderm stage Drosophila melanogaster embryo immunostained for Fushi tarazu (red), Even-skipped (purple), and Snail (green).  Nuclei are stained with DAPI (blue).  Lateral view, anterior to left, ventral down.

Drosophila embryo: April Dinwiddie and Nipam Patel

Developmental Processes

Embryonic development of the plant, Arabidopsis thaliana from heart stage (left) through torpedo stage (right).  The expression pattern of the transcription factor KAN2 (green) defines the abaxial/peripheral domain of the embryo and shoot.

Arabidopsis embryo development: Stewart Gillmor


Skeleton preparation of a stickleback fish.  Stained with Alizarin red and imaged by fluorescence microscopy.

Stickleback skeleton: Jake Hines and Nate Peters

Germline & Stem Cells

Embryonic day 18.5 mouse ovary section.  The germ cells (oocytes) in blue are stained with SCP3, all nuclei are stained with syto13 (green), and the vasculature in red is stained with pecam.

Mouse ovary: Blanche Capel

Development & Disease

This Pacific Chorus Frog (Pseudacris regilla) from a California pond was the victim of an attack by the infecting stage of a parasitic flatworm (Trematode, species Ribeiroia ondatrae).  The limb deformities (shown by Alcian blue/Alizarin red staining) are the result of an adaptive parasite host-modification.  Learn more about how trematodes cause limb deformities here and here.

Pacific Chorus Frog limb deformity: Stanley Sessions

Evolutionary & Ecological Development

Two male specimens of the African butterfly, Precis octavia sesamus, displaying a remarkable example of polyphenism.  The left specimen is the summer form, the right specimen is the winter form.  The variation in color is dependent on the temperature at which larvae and pupae are raised.

Butterfly Polyphenism: Nipam Patel