Figure 1 (Left) Enterobacteria phage T4 (T4) diagram showing detailed location of structural proteins. Head vertices consist of cleaved gp24. Gp20 is located at the head tail connector. Collar and whiskers appear to be made of the same protein, gpwac. Sheath subunits (gp18) fit into holes in the base plate and short tail fibers (gp12) are in the quiescent state. The very complex base is assembled from a central plug and six wedges. Tail fibers consist of three proteins. (From Eiserling, F.A., Bacteriophage T4, Mathews, C.K., Kutter, E.M., Mosig, G., and Berget, P.B., Eds., American Society for Microbiology, Washington, DC, 1983, 11, Reproduced with permission.) (Right) Negative contrast electron micrograph of Enterobacteria phage T4, particle stained with uranyl acetate. The bars represent 100 nm.
Figure 2 Simplified genetic map of Enterobacteria phage T4 (T4) showing clustering of genes with related functions, location of essential genes (solid bars), and direction and origin of transcripts (arrows). (After Freifelder, D. (1983). Molecular Biology. Science Books International, Boston, and Van Nostrand Reynolds, New York, p. 614. With permission.)
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