2019
Barrier breakdown was only observed in response to METH at low micromolar concentrations , with enhanced vesicular uptake peaking at 1 mu M METH .
 Chemical: METH; Chemical: METH
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: METH; Chemical: METH