Fig. 2. NT-4/5 accelerates growth of LGN neurons. White bars represent contralateral and black bars ipsilateral values. Size frequency histograms reveal that cortical NT-4/5 infusions (A) at the beginning and (B) at the peak of the critical period consistently induced shifts to larger sizes. (C,D) When (C) early and (D) late infusion periods were followed by survival to P45, the contra- and the ipsilateral population showed the same size variation and for both sides the peaks occurred at larger sizes than in the younger animals. The small insets indicate the median shifts in the individual animals analyzed.

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