503
Therefore, we describe a microtitre assay system for glucocorticoid receptors which is a whole-cell competitive binding radioassay using [3H]-dexamethasone as radioligand.
 protein: glucocorticoid receptors
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: glucocorticoid receptors