Low-power scanning electron micrographs showing BP in representative normal, lesion–short recovery, and lesion–long recovery starlings. Each panel shows a low-power scanning electron microscope image of the basal half of the BP. Scale bar: (in C ), 100 μm. A , Normal BP (from the work of Marean et al., 1993). B , BP from lesion–short recovery starling SLSR97-1, for which data are presented in Figures 3 A and 6. C , BP from lesion–long recovery starling SLLR97-5, for which data are presented in Figures 3 B and 8; note that the density of hair cells in the basal papilla appears normal, but the mosaic is abnormal.