23086
We created hydrolytically degradable hydrogel / bioceramic biocomposites , comprising poly ( 2 - hydroxyethyl methacrylate ) ( pHEMA ) hydrogels and 50 wt % biphasic hydroxyapatite / beta - tricalcium phosphate ( 60 / 40 ) through in situ polymerization .
 Chemical: poly ( 2 - hydroxyethyl methacrylate ); Chemical: pHEMA; Chemical: hydroxyapatite; Chemical: beta - tricalcium phosphate
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: poly ( 2 - hydroxyethyl methacrylate ); Chemical: pHEMA; Chemical: hydroxyapatite; Chemical: beta - tricalcium phosphate