To complete the picture of a general AHAS, not necessarily AtAHAS or Soybean AHAS, there is evidence in x-ray structures of a conformational change of AHAS in the Saccharomyces cerevisiae species. This is presumably due not to differences with AtAHAS in the catalytic site or the resistant site, but throughout the sequence and possibly the transport channel. This species of AHAS is not considered in the binding analysis.