Zebrafish embryo, cell membranes (yellow) and nuclei (red)VANESSA KNUTSONAs a confocal microscope moves through each image slice in this z-stack of a zebrafish embryo, a ripple effect is born. This striking image, along with many others, was taken as part of an embryology course this summer through the Marine Biological Laboratory in Woods Hole, Massachusetts.
Image of the Day: Embryonic Ripples
This fluttering clump of colorful cells is a zebrafish embryo, visualized by many stacked images.

