Fig. 1From: PET imaging of hepatocellular carcinoma with anti-1-amino-3-[18F]fluorocyclobutanecarboxylic acid in comparison with l-[S-methyl-11C]methionineStructures of amino acids. From left, a l-[S-11C]methionine, b [18F]FACBC, and c l-leucineBack to article page