“…It has been suggested that a fraction of plasma albumin in the kidney is present in the interstitial space (Pappenheimer & Kinter, 1956;Lilienfield et al 1958;Swann, 1960). With histological techniques Pomerantz, Slotkoff & Lilienfield (1965) found albumin, marked with a fluorescent dye, in the renal interstitium, but this observation was not confirmed by Carone, Everett, Blondeel & Stolarczyk (1967).…”