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Spermatids and spermatozoa from high percentage XL169 chimaeric mice display normal heads. Ultrastructural analysis of developing spermatid heads from high percentage XL169 chimaeric males was carried out. Panel A shows examples of the normal development of heads of step 10 spermatids. Panel B shows two examples of normal heads of step 16 elongated spermatids (stage VIII) about to be released from Sertoli cells during spermiation. Magnification is 28,000 ×.
