8374
We have previously reported that depletion of protein kinase C by long - term treatment of B16 mouse melanoma cells with phorbol dibutyrate ( PDBu ) prevented cell density - dependent melanogenesis .
 GENE: protein kinase C
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: protein kinase C 
Answer:
 GENE: protein kinase C