4931
Southern blot analysis following reverse transcription and PCR showed that B2R is expressed in most mouse tissues , except the liver and spleen , which is consistent with the wide distribution of B2R activity as deduced from pharmacological studies .
 GENE: B2R; GENE: B2R
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: B2R; GENE: B2R