5181
We compared BP metabolism in excised human skin , commercially available in vitro 3D skin models and primary 2D skin cell cultures , and analyzed the metabolically catalyzed occurrence of seven different BP follow - up products by means of liquid chromatography coupled to tandem mass spectrometry ( LC - MS / MS ) .
 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