5768
Previous reports indicate that ephrinB2 expression by osteoblasts is stimulated by parathyroid hormone ( PTH ) and its related protein ( PTHrP ) and that ephrinB2 / EphB4 signaling between osteoblasts and osteoclasts stimulates osteoblast differentiation while inhibiting osteoclast differentiation .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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