30556
MATERIALS AND METHODS : An activity - guided screening approach was used by coupling sequential solvent extraction , gel permeation chromatography ( GPC ) , and semi - preparative reverse - phase high performance liquid chromatography ( RP - HPLC ) with an in vitro dermal fibroblast migration assay .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None