title: The river of stem cells.
abstract: In this issue of Cell Stem Cell, Greco et al. (2009) characterize the hair germ as a novel stop between bulge stem cell and transient amplifying cells during hair regeneration. The work implies stem cell states can be regulated to form different numbers of intermediate stops, depending on physiological requirements.
authors.affiliation: Department of Pathology, Keck School of Medicine, University of Southern California, 2011 Zonal Avenue, Los Angeles, CA 90033, USA. cmchuong@usc.edu
authors.forename: Cheng-Ming
authors.initials: CM
authors.lastname: Chuong
authors.forename: Randall Bruce
authors.initials: RB
authors.lastname: Widelitz
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D018859:Hair Follicle / Q000166:cytology / Q000502:physiology; D012038:Regeneration / Q000502:physiology*; D013234:Stem Cells / Q000166:cytology / Q000502:physiology*