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(A) Sequence of squid CE cDNA (GenBank accession no. U49390U49390). The coding region is in boldface type. (B) Amino acid sequence of CE compared with Amphioxus SCP I (29), yeast sar1p (30), and arf1 (31). Amino acids found by peptide sequencing of the tryptic digest are underlined. (C) Possible GTP-binding sites in CE, compared with homologous regions in sar1p.
