The Action of Serum from Partially Hepatectomized Rats on Explants of Liver and Tumors.

(c) regenerating liver48hoursafterresection of two-thirds of the organ, (d) Walker carcinoma and Yoshida sarcoma, both in solid form (10—@0 days after inoculation) and as ascites tumors (3—fl days after inoculation). Inorganic radioactive phosphate (Na@HP3@O4, specific activity above 1 mc/j@g P) is measurably taken up by the explants. Incorporation is in hibited by monoiodic acetic acid and is absent in denaturated explants (8). Of the @32 absorbed, an average of 44 per cent is found after 24 hr. of in cubation in the fraction precipitated by tn chloroacetic acid (12). The radioactive phosphate added to watch-glass cultures with a semi-solid