207. Wood, C.M., Gilmour, K.G., Perry, S.F., Pärt, P., Laurent, P., and Walsh, P.J. (1998) Pulsatile urea excretion in gulf toadfish (Opsanus beta): evidence for activation of a specific facilitated diffusion transport system. J. Exp. Biol. 201 pp: 805-817. (PDF)