The structure to the right of branched chain aminotransferase was found using X-ray diffraction with a resolution of 2.20 Å. The branched chain aminotransferase found in this image was isolated from mycobacteria. This protein is made up of two identical polypeptide chains. The protein is a total of 372 residues(1). As can be seen in the image, the protein is made of helices and beta sheets.