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Science 28 November 1997:
Vol. 278. no. 5343, p. 1541
DOI: 10.1126/science.278.5343.1541o
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The pIV protein of filamentous phage pIV is part of a family of proteins that include flagellar assembly systems and systems in pathogenic bacteria that deliver toxins into mammalian cells. Linderoth et al. used scanning transmission electron microscopy to image purified pIV protein and show that it is a multimer that forms a channel-like structure.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)