Fig. 2. Sagittal sections of the glandular structures in elephant fish (A,B) and Southern chimaera (C). Sections were stained with anti-Na⁺,K⁺-ATPase serum (A,C) and with periodic acid–Schiff (PAS; B). Asterisks in A and B indicate a central duct that runs along the anteroposterior axis. Scale bar, 1 mm.