(A) albumin (molecular weight [MW] = 63 kDa), (B) plasminogen (MW= 82kDa), (C) fibrinogen (MW = 340kDa), (D) haptoglobin (MW = 100kDa). All antibodies were pig-specific, which was confirmed by testing in healthy pigs and baboons. In all cases molecular weight estimates are for the denaturated nonreduced form. (Western blot using anti-baboon antibodies was not performed, and therefore the disappearance of baboon proteins in the blood after native hepatectomy could not be confirmed.)