Eight crystalline preparations of α1-foetoprotein isolated from tumor homogenate, plasma, ascites and pleural effusions of patients with hepatocellular carcinomas showed identical antigenic determinants proved by double diffusion with 17 antisera obtained by immunization of rabbits with different pure human α1-foetoprotein preparations isolated from foetal material, tumor extracts, plasma, ascites or pleural effusions and with antisera to dog, beef and pig α1-foetoprotein.
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