12842
Consistent with this feedback loop having a functional role in these cell models , pharmacological inhibitors of PI3K and ornithine decarboxylase potentiated each other in inhibiting tumour growth in a xenograft model .
 Chemical: ornithine
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: ornithine 
Answer:
 Chemical: ornithine