title: Tools for observing and controlling specific molecular or physiological pathways in intact cells and tissues. Preface.
authors.forename: Thomas
authors.initials: T
authors.lastname: Knöpfel
authors.forename: Edward S
authors.initials: ES
authors.lastname: Boyden
mesh_terms: D000818:Animals; D055537:Light Signal Transduction / Q000235:genetics; D057054:Molecular Imaging / Q000295:instrumentation / Q000379:methods*; D055355:Opsins / Q000235:genetics
chemical_list: D055355:Opsins