The histological structure of trophonemata will be described. Donald H.3 Poster 1. The renal kallikrein-kinin system in mammals participates in the regulation of urine volume. We have begun to characterize the components of this system in the stingray in order to investigate its possible role in the regulation of renal function in elasmobranch fish. When the euryhaline Atlantic Stingray Dasyatis sabina travels from seawater into estuarine waters, a compensatory increase in urine volume occurs, but the regulation of this process is not understood.
Immunohistochemical studies show localization in extraglomerular cells of the mesangium.
KLA in other osmoregulatory tissues also increased after dilution. The evidence suggests that a kallikrein-kinin system exists in the Atlantic Stingray, and that the system may be involved in osmoregulation. Supported by NIH HL44671. 2W1 Canada 2. A further study was conducted to relate elasmobranch membrane composition to the effects of these organic solutes.