7673
HLA class I -mediated inactivation of Rb can be inhibited specifically by neutralizing Abs to basic fibroblast growth factor ( bFGF ), suggesting a role for FGF receptors in the signaling process.
 protein: Rb; protein: FGF receptors; protein: neutralizing Abs; protein: HLA class I; protein: bFGF; protein: basic fibroblast growth factor
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: Rb, FGF receptors, neutralizing Abs, HLA class I, bFGF, basic fibroblast growth factor 
Answer:
 protein: Rb; protein: FGF receptors; protein: neutralizing Abs; protein: HLA class I; protein: bFGF; protein: basic fibroblast growth factor