“…One of these (L-CaBP) has a molecular weight of 28.000 and seems to resemble the chick D-CaBP mentioned above, and has been isolated from rat kidney [Hermsdorf and Bronner, 1975], human kidney [Piazolo et al, 1971;Morrissey and Rath, 1974], and dog kidney [Sands and Kessler, 1971], as well as from human brain [Baimbridge et al, 1980], The antisera raised against L-CaBP from human kidney react against D-CaBP from chick duodenum [Morrissey et al, 1975[Morrissey et al, , 1978a and the antiserum raised against chick duodenal D-CaBP gives immuno-chemical staining in chick brain [Roth et al, 1981] and rat brain [Jamie et al, 1981b] and also rat kidney [Rhoten and Christakos, 1981]. The second mammalian vitamin D-dependent CaBP (S-CaBP) has a smaller molecular weight (9.000) and has been isolated from rat and pig intestinal mu cosa [Hitchman and Harrison, 1972;Moriuchi et al, 1975] where it predominates in the duodenum, and it has been detected by RIA in many other organs of the pig Murray et al, 1974Murray et al, . 1975, Using antiserum raised against chick D-CaBP, the cellular localization of this protein has been described by immunohisto chemical techniques in many organs of chick [Lipiello and Wasserman, 1975;Taylor, 1981;Jande et al.…”