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Histidine dipeptides are present in micromolar to millimolar range in the tissues of vertebrates , where they are involved in a variety of physiological functions such as pH buffering , metal chelation , oxidant and aldehyde scavenging .
 Chemical: Histidine; 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: Histidine; Chemical: aldehyde