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Ras involvement in signal transduction by the serotonin 5 - HT2B receptor .
 GENE: Ras; GENE: serotonin 5 - HT2B receptor
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: Ras; GENE: serotonin 5 - HT2B receptor