Boi (green) and Hedgehog (Hh, red) are expressed in apical cells of the Drosophila wild-type germarium. In the absence of boi (boi[e] mutant), Hh is redistributed from apical cells to the extracellula...

Lilium longiflorum (Easter Lily) pollen. This is a thin optical section through the center of the desiccated stage of the mature pollen showing autofluorescence or harmonic generation of intrinsic st...

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...

Colorized scanning electron micrograph of pollen on the anther of a hedge mustard (Sisymbrium officinale) flower. This plant is reputed to have various medicinal properties including its ability to tr...

Imaging an HIV infected dendritic cell reveals numerous viral particles at the tips of filopodia. Actin-based membrane extensions from the dendritic cell are phallodin stained (red). HIV particles (wh...

Movie shows spindle assembly around DNA-beads in a Xenopus laevis egg extract. DNA beads are autofluorescent, and spindle is formed from exogenous X-rhodamine-labeled tubulin. By the end of the movie...

The events of meiosis I in a living insect spermatocyte beginning at metaphase with bivalents at the spindle equator, followed by anaphase onset, chromosome segregation and the start of cytokinesis. T...

Figures 206 (upper) and 207 (lower) from Chapter 6 (Golgi Apparatus) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. During development of the acrosome in the chinchilla spermatid, the transitional zon...

Living Lilium pollen tube imaged with DIC optics. Shown is the growing tip with the apical region devoid of cytoplasmic organelles. Other images in the group reveal the distributions of cytoskeletal ...

A colorized scanning electron micrograph of a human egg, which is the huge cell colored yellow at the bottom of this image. The follicle cells that surround it (top) send out long projections that pen...