12176
The JAK2 V617F mutation is present in the majority of PV patients , and about 50 % of patients with essential thrombocythemia ( ET ) and primary myelofibrosis ( PMF ) are affected .
 None
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:  
Answer:
 None