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Further evidence for the mediation of the relaxant response via the 5 - HT7 receptor is provided by the localization of messenger ribonucleic acid transcripts encoding the 5 - HT7 receptor in many blood vessels [ 67 ] .
 Anatomy: blood vessels
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Anatomy: blood vessels