“…However such photo-dependent inhibition cannot occur in the abdominal cavity. The inhibition of red cell Na+K+ ATPase in the dark is a controversial matter (Blaiklock and Green, 1971;Borgese and Green, 1962). Liver plasma membrane Na+K+ ATPase activity is inhibited in the dark by concentrations 1000 times lower than those produced in rabbit bile by an intravenous injection of rose bengal which lowers the bile flow, that is 6 mg/ml (Dhumeaux, personal communication).…”