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The binding mode of the crystalized bioisosteres were compared with those of the crystalized alpha - amino acids that bind in the same domain , and where no data on the crystal structure were available , the displacement studies of known orthosteric ligands were used .
 Chemical: alpha - amino acids
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: alpha - amino acids