The structure of the particle of a new bacteriophage Pseudomonas phiKZ was studied. The particle of phiKZ bacteriophage was shown to have some features distinguishing this phage from all those known heretofore: a large size of the head and DNA and the presence in the head of a special structural formation named the central body. The central has a cylindrical shape and may be isolated from the head of the phage by repeated freezing-thawing the phage preparation. The structure of the central body is complicated. Possible functions of the central body are discussed.
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