Abstract

Examination of thin sections of the trypanosomid flagellate Strigomonas oncopelti in the electron microscope has revealed some internal structure in the kinetoplast of this organism; two main parts have been distinguished: a central, electron-transparent area which contains a fine network of filaments and granules, and a more electron-dense peripheral area which resembles nuclear material in appearance. In transverse sections of flagella the usual arrangement of 9 peripheral and 2 axial fibres has been observed; some evidence has been obtained which suggests that the two axial fibres may be missing in the region of the kinetoplast. A possible relationship between the flagellum and kinetoplast is discussed.

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