Ratner, M.A. & Decker, S.E. & Aller, S.G. & Weber, G. & Forrest, J.N. (2006)
Mercury toxicity in the shark (Squalus acanthias) rectal gland: apical CFTR chloride channels are inhibited by mercuric chloride. Journal of Experimental Zoology Part A, Comparative Experimental Biology, 305(3), 259–267
DOI: 10.1002/jez.a.257

Forrest, J.N. & Aller, S.G. & Wood, S.J. & Ratner, M.A. & Forrest, J.K. & Kelley, G.G. (1997)
Cadmium Disrupts the Signal Transduction Pathway of Both Inhibitory and Stimulatory Receptors Regulating Chloride Secretion in the Shark Rectal Gland. Journal of Experimental Zoology, 279, 530–536