Biomedical Picture of the Day (BPod), is hosted by the Biochemistry Department at the University of Oxford. It is a not-for-profit educational resource whose goal is to engage everyone in not only the wonders of biology, but the influence on medicine.
The photo is part of Yelena Bernadskaya's research on precursor cells. The image is rendered microscopy images of initiation of Ptch1 transcription (yellow spheres) in the migrating cardiopharyngeal precursor cells. To see the post on the BPod website click here.