Ready-to-use ELISA kits are available for the detection of serum amyloid A 1, an alias of the protein, serum amyloid A1. The official gene symbol is SAA1. The protein, with a mass of 13.5 kDa and length of 122 residues, is reported to be secreted. It is a member of the SAA family and may be known by other names, including: PIG4, tumor protein p53 inducible protein 4, serum amyloid A protein, and serum amyloid A-1 protein.