Fig. 6.

Dark-rearing does not alter the laminar pattern of immunostaining in primary visual cortex. At P15 in both normal cats (A) and after 2 weeks of dark-rearing beginning at P1 (B), layers 2/3 and 5 are stained most intensely. At P53, layer 4 is equally as intensely stained as layers 2/3 in both normal (C) and dark-reared (D) animals. At P104, the visual cortex of normal animals (E) and animals dark-reared from shortly after birth (F) exhibit high levels of immunostaining in layers 2/3, whereas layers 4–6 are stained less intensely. Scale bar, 300 μm.