1501
The recombinant protein was purified to homogeneity by ( NH4 ) 2SO4 - precipitation and affinity chromatography on 5 ' AMP - Sepharose .
 None
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:  
Answer:
 None