1735
The inhibitory effect exerted by anti- CD28 was observed at the level of DNA binding as well as in functional reporter-gene assays .
 protein: CD28; protein: anti- CD28
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: CD28, anti- CD28 
Answer:
 protein: CD28; protein: anti- CD28