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SAM enters the ethylene , nicotianamine and polyamine biosynthetic pathways and provides the methyl group for the majority of methylation reactions required for plant growth and development .
 Chemical: SAM; Chemical: ethylene; Chemical: nicotianamine; Chemical: methyl
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: SAM, ethylene, nicotianamine, methyl 
Answer:
 Chemical: SAM; Chemical: ethylene; Chemical: nicotianamine; Chemical: methyl