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Scanning electron microscopy images of phage ϕ229-2, a podophage (A) and phage ϕNH-4, a myophage (B), stained with 0.2% phosphotungstic acid. The arrows point to the short tail (10 to 20 nm long) of the podophage in panel A and to the contracted tail sheath of the myovirus in panel B.
