Figure 8.

Expression pattern of FoxP1 was distinct from but partially overlapping with that of FoxP2. A, FoxP1, like FoxP2, was expressed in the dorsal thalamus and striatum in adult zebra finches (A). In addition, it was expressed in vocal nuclei HVC, RA, and Area X (but not lMAN) at higher levels than their surrounding regions and in the mesopallium. Both male (B) and female (C) strawberry finches, male song sparrow (D), as well as the parrot (F) expressed more FoxP1 mRNA in Area X (MMSt in parrot) than in the surrounding striatum. E, A vocal non-learner, the ring dove, also expressed FoxP1 mRNA in the subpalllial and pallial areas. G, The crocodile had a telencephalic pattern very similar to that of birds. All sections are sagittal, except the parrot sections in F, which are frontal. Scale bars: A–D, 1 mm; E–G, 2 mm.