6652
KEGG OC has the following two features : ( i ) It consists of all complete genomes of a wide variety of organisms from three domains of life , and the number of organisms is the largest among the existing databases ; and ( ii ) It is compatible with the KEGG database by sharing the same sets of genes and identifiers , which leads to seamless integration of OCs with useful components in KEGG such as biological pathways , pathway modules , functional hierarchy , diseases and drugs .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None