Abstract
In this review I have described our current view about the mode of packaging of DNA in house cricket (Gryllus bimaculatus) spermatids. DNA is oriented as the helix axis of it is parallel to the long axis of the nucleus. About two hundred and forty DNA fibers are bundled into one unit, 300Å fiber. More than two hundred 300Å fibers are packed also parallel in one nucleus. In mature cells histones have been replaced by another kind of protein (Mr=17, 000), which is not so basic as they. This mode of packaging of DNA cannot be the nucleosome structure. The packaging ratio (the ratio of the volume of DNA to that of the nucleus) of this system is about 1 and shows effectiveness much higher than that of solenoid structure in the nucleosome theory but similar to that of the packaging of DNA in λ phage head.
