6423
In F42A - stimulated internalization assays on forskolin - induced YT - 1 cells , the IL - 2R alpha chain is consistently endocytosed together with the IL - 2R beta subunit indicating that IL - 2R alpha is stably associated with the F42A - IL - 2R beta complex even though the alpha - subunit contributes little if any affinity to the F42A binding reaction .
 GENE: IL - 2R alpha chain; GENE: IL - 2R beta subunit; GENE: IL - 2R alpha; GENE: F42A - IL - 2R beta complex
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: IL - 2R alpha chain, IL - 2R beta subunit, IL - 2R alpha, F42A - IL - 2R beta complex 
Answer:
 GENE: IL - 2R alpha chain; GENE: IL - 2R beta subunit; GENE: IL - 2R alpha; GENE: F42A - IL - 2R beta complex