Table 1.

Clasp response after tail suspension

	+/+	−/−	Fisher's test
Young (≤ 10 month old)	0/25	3/20	P = 0.08
Old (≥ 20 month old)	0/6	11/12	P = 0.0004

Numerators indicate the number of mice showing clasp response, and denominators indicate the numbers of mice tested.