Most respiring anaerobes are heterotrophs, although some do live autotrophically. Desulfurococcaceae are anaerobic, sulfur respiring, extreme thermophiles. Later, actively respiring microorganisms consume the oxygen and allow the fluorescence to be detected. They are conjectured to occur in all respiring organisms. Reductive dehaholagenses (EC 1.97.1.8) are a group of enzymes utilized in organohalide respiring bacteria. It is notable for respiring oxyanions of selenium and arsenic. This group found that cells capable of respiring could not divide after exposure to HOCl. This method is commonly used for fresh respiring fruits and vegetables.