11908
r - Cam - dis was further purified by two - step chromatography consisting of HiTrap (TM) Benzamidine FF column , followed by Talon Metal affinity column with a final yield of 1 mg / L culture .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None