title: Sheath of bacteriophage T4. 3. Contraction mechanism deduced from partially contracted sheaths.
mesh_terms: D003090:Coliphages / Q000502:physiology*; D004926:Escherichia coli; D005557:Formaldehyde; D006863:Hydrogen-Ion Concentration; D008722:Methods; D008854:Microscopy, Electron
chemical_list: D005557:Formaldehyde