20506
Our previous study has revealed that p - cresol increased intracellular calcium levels and activated protein kinase C alpha ( PKC alpha ) by phosphorylation .
 Chemical: p - cresol; Chemical: calcium
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: p - cresol; Chemical: calcium