title: Sorting sloppy Sonic.
abstract: In the classic picture of morphogen-mediated patterning, cells acquire the correct spatial arrangement of specified fates by reading a precisely distributed gradient of morphogen. Xiong et al. now provide evidence for an alternate strategy-cells of the zebrafish neural tube actively sort to their correct positions following disordered specification by Sonic hedgehog.
authors.affiliation: Department of Molecular Biology and Howard Hughes Medical Institute, Princeton University, Princeton, NJ 08544, USA.
authors.forename: Shawn C
authors.initials: SC
authors.lastname: Little
authors.forename: Thomas
authors.initials: T
authors.lastname: Gregor