2292
FGF - 23 started to increase from the 4th week of UVB exposure then significantly at the 4th week after withdrawal of UVB ( 27 . 8 pg / mL to 41 . 4 pg / mL , p < 0 . 05 ) .
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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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