“…We have recently reported the isolation of lipid mobilizing fractions from pituitary g1ands (Schleyer, Straub and Pfeiffer, 1969a). By combining the methods of Anselmino and Hoffmann (1931) and Bonsnes and White (1940) we obtained a fraction labeled as P IV. Compared with the rest of the fractions isolated from hog pituitary g1ands, P IV showed the bighest Iipolytic activity on isolated rat fat ceUs (Schleyer, Straub, Faulhaber and Pfeiffer, 1969b).…”