8541
Predicted vertebrate ALDH2 and ALDH1B1 subunit sequences and structures were highly conserved , including residues previously shown to be involved in catalysis and coenzyme binding for human ALDH2 .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None