14818
Previously , an ion - coupled protein binding ( ICPB ) model was proposed to explain the thermodynamics of protein binding to negatively charged alpha - Zr ( IV ) phosphate ( alpha - ZrP ) .
 alpha - Zr ( IV ) phosphate, alpha - ZrP
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 alpha - Zr ( IV ) phosphate, alpha - ZrP