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The primary structure of a non-immunoglobulin amyloid protein AS has been determined. The protein was found to consist of 76 amino acid residues corresponding to a molecular weight of 9145. The sequence analysis showed clearly that the protein was homogeneous. A characteristic distribution of hydrophobic amino acids was observed and suggested as being of importance for the ability of this protein to form fibrils. A comparison of the protein with other amyloid protein AS showed a high degree of variability, particularly in the carboxyl-terminal region. [ABSTRACT FROM AUTHOR]