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Transmission electron micrograph of φLmd1. Phage particles were purified on CsCl gradients according to Boulanger (7), negatively stained with 2% (wt/vol) uranyl acetate on a carbon-Formvar membrane grid, and examined on a FEI Morgagni 268 (FEI Company B.V., Eindhoven, The Netherlands) microscope at an accelerating voltage of 100 kV. Bar, 100 nm.
