24089
Conversely , despite varying mRNA and protein levels of phase 2 enzymes , functional activity of glutathione S - transferases , N - acetyltransferase 1 , and UDP - glucuronosyltransferases were all readily measurable in whole skin and in vitro skin models at activity levels similar to those measured in the liver .
 Chemical: glutathione; Chemical: S; Chemical: N; Chemical: UDP
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: glutathione, S, N, UDP 
Answer:
 Chemical: glutathione; Chemical: S; Chemical: N; Chemical: UDP