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Tris ( hydroxymethyl phosphine ) cross - linked RLP hydrogels were able to maintain their mechanical integrity as well as the viability of encapsulated primary human mesenchymal stem cells ( MSCs ) .
 Chemical: Tris ( hydroxymethyl phosphine )
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: Tris ( hydroxymethyl phosphine )