Archive: Thu Feb 2014

Close-up of a live ~5 hour-old zebrafish embryo. Individual cells are distinguishable, as well as nuclei, visible as circles within each cell. At this developmental stage, cells are actively moving and dividing, and their fates have not yet been…

After only 24 hours of development, this live zebrafish embryo already has eyes, muscles, blood, and many other tissue types. See this Flash article for more info on zebrafish: http://sitn.hms.harvard.edu/flash/2012/issue120/

Cells in a ~5 hour-old zebrafish embryo. The cell membranes are labeled in red. The green dots are clumps of a signaling protein called FGF8 that has been fused to a green fluorescent protein. See this Flash article for more info on zebrafish:…

DNA doesn’t just float freely inside a cell; in eukaryotes, it is organized into successively more complicated structures to form chromatin. Nucleosomes are the most fundamental unit of DNA packaging in eukaryotes. They’re composed of an…