s-Rice Polypeptide-1 is a single chain peptide produced synthetically to be identical to the protein, Glucose-1-Phosphate Adenylyltransferase Small Subunit 2, Chloroplastic/Amyloplastic/Cytosolic, derived from Oryza sativa. The protein contains a maximum of 504 amino acids which may contain disulfide bonds and/or glycosylation, and consists of the proper sequence of the 20 standard amino acids.