title: An Explicit Source for Extrinsic Noise.
abstract: A new study by Sherman et al. introduces a rigorous way to treat extrinsic noise with theory, isolates its prominent sources in vivo, and sharpens our understanding of biological heterogeneity.
authors.affiliation: Cell Systems, Cell Press, 50 Hampshire Street, Cambridge, MA 02139, USA. Electronic address: qjustman@cell.com.
authors.forename: Quincey A
authors.initials: QA
authors.lastname: Justman