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. 2002 Oct 1;22(19):8684–8690. doi: 10.1523/JNEUROSCI.22-19-08684.2002

Fig. 1.

Fig. 1.

A, Sagittal view of the canary brain with the relative positions of HVC, RA, Area X, and nXIIts.Black arrows show the direction of projections between these nuclei. B, Experimental protocol used in this study. Birds were castrated on day 0 (crossed male symbol) and received twice-daily injections of3H-thymidine for 5 d (days 10–14) and an injection of fluorogold tracer into RA on day 59. Amount of singing was scored during the month from day 29 to day 59 after castration. The birds were killed on day 65.