26385
Specifically , small ( =~ 5 - 20 micro m ) mineral deposits are observed at the periphery of the hydrogels near the dermis / scaffold interface using Von Kossa and alizarin red staining .
 alizarin red
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 alizarin red