22301
The results showed that beta - casein in UK retail milk comprises approximately 0 . 58 , 0 . 31 , 0 . 07 and 0 . 03 A2 , A1 , B and C protein variants , respectively .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None