When mice lack these proteins in particular clusters of nerves, the mice either die within 24 hours of birth (blue, purple) or have breathing problems as adults (red). (sciencenews.org)
Hox genes are arranged in particular clusters on an animal genome and only a subset of Hox genes are active in a given cell. (sciencedaily.com)
Harvard University astrophysicist Charlie Conroy and colleagues studied these two particular clusters because they are far from the galactic centers of the Milky way and Andromeda galaxies; that distance has shielded them from cosmic turbulence and kept them — and any putative dark matter — in a relatively pristine state. (sciencemag.org)