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The mean number of type I and type II receptors was significantly lower in aged subjects than in controls (respectively, 198 +/- 96 and 272 +/- 97 receptors /cell for type I , and 1,794 +/- 803 and 3,339 +/- 918 for type II receptors ).
 protein: II receptors; protein: receptors; protein: type I
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: II receptors; protein: receptors; protein: type I