5384
In vivo transdermal absorption studies in rats confirmed the enhancing activity of l - Pro2 and suggested its negligible skin toxicity and minimal effect on transepidermal water loss .
 Chemical: l - Pro2
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: l - Pro2