Fig. 1.

Microtubule (MT) placements and corresponding N-methyl-D-aspartic acid injection (100 mM, 500 nl) responses expressed as percent of control (inset) for animals used in this study. MT placements ranged throughout the rostral-caudal distances indicated here, but for simplicity, placements are illustrated on only three representative sections. Tissue from one animal was unusable for Nissl staining. Numbers above each section indicate approximate rostral distance from obex. Red circle indicates approximate location of the goat pre-Bötzinger complex.