Here's What it Looks Like When A Gene 'Turns On'

In the murky darkness, blue and green blobs are dancing. Sometimes they keep decorous distances from each other, but other times they go cheek to cheek -- and when that happens, other colors flare. The video, reported last year, is fuzzy and a few seconds long, but it wowed the scientists who saw it. For the first time, they were witnessing details of an early step -- long unseen, just cleverly inferred -- in a central event in biology: the act of turning on a gene. Those blue and green