to investigate directly whether a sodium-potassium-chloride cotransport system is operating in the mammalian thick ascending limb of henle 's loop ( talh ) and in the elasmobranch rectal gland , plasma membrane vesicles were prepared from talh cells isolated from rabbit kidney outer medulla and from rectal glands of squalus acanthias , and chloride uptake was measured by a rapid filtration technique .
C0037494
sodium
C0008203
chloride