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Using this approach , we purified a family B GPCR , parathyroid hormone 1 receptor ( PTH1R ) , which regulates calcium and phosphate homeostasis and is a drug target for osteoporosis .
 Chemical: calcium; Chemical: 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: calcium; Chemical: phosphate