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Interleukin-9 receptor (IL-9R) complex consists of a ligand-specific alpha chain and IL-2R gamma chain .
 protein: ligand-specific alpha chain; protein: Interleukin-9 receptor (IL-9R) complex; protein: IL-2R gamma chain
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: ligand-specific alpha chain, Interleukin-9 receptor (IL-9R) complex, IL-2R gamma chain 
Answer:
 protein: ligand-specific alpha chain; protein: Interleukin-9 receptor (IL-9R) complex; protein: IL-2R gamma chain