22274
In this study , we examined whether baby aloe shoot extract ( BAE , immature aloe extract ) , which is from the one - month - old shoots of Aloe vera , and adult aloe shoot extract ( AE ) , which is from the four - month - old shoots of Aloe vera , have a protective effect on UVB - induced skin photoaging in normal human dermal fibroblasts ( NHDFs ) .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None