Figure 4.
Histological analysis of the PC-ablated brain of the slugs. Toluidine blue-stained sections of the brains of (A) 11 randomly chosen slugs that had not avoided the conditioned odor of the carrot juice and (B) five randomly chosen slugs that avoided the conditioned odor of the carrot juice. (C) A section of the brain from a naive slug. The arrow indicates the PC. Scale bar, 500 μm.
