15185
Each subtype of the Histone Deacetylase ( HDAC ) family perform a distinct role in the gene expression and cyclic peptides with their plentiful set of surface contacts , zinc binding group and macrocyclic cap , can target enzyme precisely through adequate modulation of the amino acid configurational and structural assortment .
 Chemical: zinc; Chemical: amino acid
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: zinc; Chemical: amino acid