Table 1.

Comparison of porcine insulin and progesterone on the meiotic response using denuded Rana pipiens Oocytes

Additions1	Meiotic response	Meiotic response
	% Nuclear breakdown	% 2nd Metaphase arrest
None	0 (6)2	0 (6)
Insulin, 10 μM	74 ± 5.2 (4)	0 (4)
Progesterone, 0.32 μM	97 ± 3.8 (4)	29 ± 3.8 (4)
Insulin , 10 μM + Progesterone, 0.32μM	99 ± 2 (4)	96 ± 1.1 (4)

¹Incubated in modified Ringer’s solution for 24 h at 20–22ºC. Experiments were carried out in February-March. Values shown are the maximal response.

²Mean ± SD (Number of frogs).