Table I. Meiotic progression of wild-type (WT) and TR^–/– G₄ mouse oocytes^a.

	9 h of culture				12–14 h of culture
Oocyte	Number examined	Stage of meiosisb			Number examined	Stage of meiosisb
		GV–GVBD	MI (%)	AI–TI		GV–GVBD	MI	AI–TI	MII (%)
WT	39	1	31 (79%)	7	28	0	3	0	25 (89%)
			1 misaligned						0 misaligned
TR–/– G4	17	6	6 (35%)	5	21	5	3	1	12 (57%)
			4 misaligned						8 misaligned

^aDetermined by immunofluorescence staining and confocal microscope.

^bGV, germinal vesicle; GVBD, germinal vesicle breakdown; MI, metaphase of meiosis I; AI, anaphase I; TI, telophase I; MII, metaphase of meiosis II.