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In order to ascertain the degree of conservation of these residues among AMADHs and to evaluate their possible relevance in determining the aminoaldehyde specificity , we compared the known amino acid sequences of every ALDH family that have at least one member with known crystal structure , as well as the electrostatic potential surface of the aldehyde binding sites of these structures .
 Chemical: aminoaldehyde; Chemical: amino acid; Chemical: aldehyde
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: aminoaldehyde; Chemical: amino acid; Chemical: aldehyde