The growth of the ilium in the domestic fowl (Gallus domesticus).
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Four phases of spermatid maturation are recognized on the basis of nuclear morphology. The formation of the acrosome, perforatorium and axial filament complex are described in relation to these phases. The functional significance of the microtubular systems in nuclear elongation and spermatid curvature are discussed. A membranous structure, hitherto unidentified, and referred to in this study as the 'membrane body' is compared with the chromatoid body. Morphological evidence suggests that this structure, together with the annulate lamellae, removes excessive nuclear material.
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