The extract obtained from the scuds contained hundreds of colorless proteins in addition to LDH. LDH, or Lactate Dehydrogenase, is found in various muscle tissues. LDH is an isoenzyme, which means that the LDH enzyme has different molecular forms. LDH has five distinct forms which are represented by different tissues in different amounts. Because LDH has various molecular forms, the electrophoretic mobilities of the LDH isoenzymes are different. In order to identify the LDH isoenzymes, gels are dyed in special LDH substrate after the electrophoresis. The LDH substrate picks up the LDH bands.