3220
Prior studies showed enhancement of such carcinogenesis by repeated 20 rad head and neck X - radiation exposures , and it was proposed that one possible mechanism was radiogenic alteration of the functional microvasculature in a manner which favored subsequent tumor development .
 Anatomy: head; Anatomy: neck; Anatomy: microvasculature; Anatomy: tumor
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: head; Anatomy: neck; Anatomy: microvasculature; Anatomy: tumor