Retrograde labeling in ipsilateral auditory cortex after CTb tracer deposits in the IC. Roman numeralsindicate cortical layers. A, Labeling in a mustached bat (Fig. 2A,B, case 5). Retrograde transport to the amygdala after the ICC deposit is shown in Figures 3A and 4A.B, Labeling in a mustached bat (Fig.2A, case 2). C, Labeling in a pallid bat (Fig. 2C,D,case 20). Retrograde transport to the amygdala after the ICC deposit is shown in Figures 3B and 4B. D, Labeling in a pallid bat (Fig. 2C, case 13) after four CTb deposits in regions tuned near 15 kHz. Protocol for all photomicrographs was as follows (plan apochromat): NA 0.16.