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We also describe some methods that are useful for studying the biological decomposition of microcystins , including screening for microcystin degraders and detecting microcystin degradation products , with an emphasis on mass spectrometric methodology .
 Chemical: microcystins; Chemical: microcystin; Chemical: microcystin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: microcystins; Chemical: microcystin; Chemical: microcystin