The α-tubulin distribution around chromosomes in sheep oocytes after different periods of <i>in vitro</i> maturation.

<p>Red indicates chromosomes and green indicates α-tubulin. (A1-C1, 4 h) Oocytes show GVBD in the control group (group I, A1, 10×40) and the 10⁻⁴ mol/l U0126 group (group III, C1, 10×20), but remain in the germinal vesicle stage in the 10⁻⁶ mol/l U0126 group (group II, B1,10×40); (A2-C2, 8 h) chromosome condensation (A2, 10×40), beginning of chromosome condensation (B2,10×20), and GVBD (C2, 10×40); (A3-C3, 12 h) telophase of meiosis I (A3, 10×20; B3, 10×40), and chromosome condensation (C3, 10×40); (A4–C4, 24 h) meiosis II (A4, B4, 10×40), and telophase of meiosis I (C4, 10×20).