Table 1. Number of animals from each group in which a distinct 14 kDa band representing the mature form of BDNF was detected in each song nucleus using Western blot analysis.

	LMAN	Area X (MSt)	HVC	RA
Male Control	2	0	5	6
Male E2	3	0	6	5
Female Control	2	0	3	5
Female E2	1	0	4	5

Sample size was 6 in each case.